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# RDF for Tidyverse Lovers
### Carl Boettiger
### 2018/03/12

---


---
class: left, top, inverse
background-image: url(img/uglyduckling.jpg)

# RDF: Ugly Duckling


```r
cat(readLines(system.file("extdata/ex2.xml", package="rdflib")), sep= "\n")
```

```
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"&gt;
  &lt;rdf:Description rdf:nodeID="b0"&gt;
    &lt;rdf:type rdf:resource="http://schema.org/Person"/&gt;
  &lt;/rdf:Description&gt;
  &lt;rdf:Description rdf:nodeID="b0"&gt;
    &lt;ns0:name xmlns:ns0="http://schema.org/"&gt;Jane Doe&lt;/ns0:name&gt;
  &lt;/rdf:Description&gt;
  &lt;rdf:Description rdf:nodeID="b0"&gt;
    &lt;ns0:url xmlns:ns0="http://schema.org/" rdf:resource="http://www.janedoe.com"/&gt;
  &lt;/rdf:Description&gt;
  &lt;rdf:Description rdf:nodeID="b0"&gt;
    &lt;ns0:jobTitle xmlns:ns0="http://schema.org/"&gt;Professor&lt;/ns0:jobTitle&gt;
  &lt;/rdf:Description&gt;
  &lt;rdf:Description rdf:nodeID="b0"&gt;
    &lt;ns0:telephone xmlns:ns0="http://schema.org/"&gt;(425) 123-4567&lt;/ns0:telephone&gt;
  &lt;/rdf:Description&gt;
&lt;/rdf:RDF&gt;
```

---
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# The Semantic Web is the Future of the Internet...

---
class: center, middle, inverse

# ... and always will be.

 -- Peter Norvig,  
    Director of Research,  
    Google Inc.


---
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background-image: url(img/steampunk.jpg)

# RDF as Steampunk?


---
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background-image: url(img/tetris.jpg)

# All Data are Tabular

---
class: center, top, inverse
background-image: url(img/tetris-lose.jpg)

# All Data are Definitely Not Tabular


---
class: center, middle, inverse
background-image: url(img/factory-farm.jpg)


# Factory Farm Data

---
class: center, middle, inverse
background-image: url(img/organic-farm.png)


# Or Handcrafted, Organic Data?

---
class: center, middle, inverse

# Heterogeneous Data is Hard


---
class: center, top, inverse
background-image: url(img/field-notes.jpg)

# Heterogeneous Data in Ecology 


---
class: center, top, inverse
background-image: url(img/neon.png)

# Heterogeneous Data in Ecology 


---
class: center, top, inverse
background-image: url(img/integration.png)


# Ecological Metadata Language


---
class: center, middle
background-image: url(img/codemeta.png)

# CodeMeta


---
class: center, top, inverse
background-image: url(img/no-data-lake.jpg)

# The Data Lake

---
class: center, top, inverse
background-image: url(img/data-lake.jpg)

# The Data Lake


---
class: center, middle, inverse

# From Schema on Write

# To Schema on Read

---
class: center, middle, inverse


# All Data Really is Tabular


---
class: center, middle, inverse

# `tidyr::gather()` all the things!


---
class: left, top, inverse

# `tidyr::gather()` all the things!


```r
mtcars %&gt;% 
  rowid_to_column("id") %&gt;% 
  gather(property, value, -id)
```

```
    id property               value
1    1    Model           Mazda RX4
2    2    Model       Mazda RX4 Wag
3    3    Model          Datsun 710
4    4    Model      Hornet 4 Drive
5    5    Model   Hornet Sportabout
6    6    Model             Valiant
7    7    Model          Duster 360
8    8    Model           Merc 240D
9    9    Model            Merc 230
10  10    Model            Merc 280
11  11    Model           Merc 280C
12  12    Model          Merc 450SE
13  13    Model          Merc 450SL
14  14    Model         Merc 450SLC
15  15    Model  Cadillac Fleetwood
16  16    Model Lincoln Continental
 [ reached getOption("max.print") -- omitted 368 rows ]
```


---
class: center, middle, inverse

# Atomizing your data


---
class: left, middle

# Row, Column, Cell

&lt;table&gt;
 &lt;thead&gt;
  &lt;tr&gt;
   &lt;th style="text-align:left;"&gt; Model &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; mpg &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; cyl &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; disp &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; hp &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; drat &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; wt &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; qsec &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; vs &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; am &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; gear &lt;/th&gt;
   &lt;th style="text-align:right;"&gt; carb &lt;/th&gt;
  &lt;/tr&gt;
 &lt;/thead&gt;
&lt;tbody&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Mazda RX4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 21.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 160.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 110 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.90 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.620 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 16.46 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Mazda RX4 Wag &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 21.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 160.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 110 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.90 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.875 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.02 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Datsun 710 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 22.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 108.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 93 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.85 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.320 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.61 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Hornet 4 Drive &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 21.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 258.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 110 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.08 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.215 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 19.44 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Hornet Sportabout &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.7 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 360.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 175 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.15 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.440 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.02 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Valiant &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 225.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 105 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.76 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.460 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 20.22 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Duster 360 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 14.3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 360.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 245 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.21 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.570 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 15.84 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 240D &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 24.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 146.7 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 62 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.69 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.190 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 20.00 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 230 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 22.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 140.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 95 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.92 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.150 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 22.90 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 280 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 19.2 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 167.6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 123 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.92 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.440 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.30 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 280C &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 167.6 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 123 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.92 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.440 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.90 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 450SE &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 16.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 275.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 180 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.07 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4.070 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.40 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 450SL &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 275.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 180 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.07 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.730 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.60 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Merc 450SLC &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 15.2 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 275.8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 180 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.07 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.780 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.00 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Cadillac Fleetwood &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 10.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 472.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 205 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.93 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 5.250 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.98 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Lincoln Continental &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 10.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 460.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 215 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.00 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 5.424 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.82 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Chrysler Imperial &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 14.7 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 8 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 440.0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 230 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3.23 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 5.345 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 17.42 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 0 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 3 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Fiat 128 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 32.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 78.7 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 66 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4.08 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2.200 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 19.47 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Honda Civic &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 30.4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 75.7 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 52 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4.93 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1.615 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 18.52 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 2 &lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
   &lt;td style="text-align:left;"&gt; Toyota Corolla &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 33.9 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 71.1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 65 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4.22 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1.835 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 19.90 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 4 &lt;/td&gt;
   &lt;td style="text-align:right;"&gt; 1 &lt;/td&gt;
  &lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;


---
class: left, middle, inverse

# Object, Property, Value


```
[
  {
    "Model": "Mazda RX4",
    "mpg": 21,
    "cyl": 6,
    "disp": 160,
    "hp": 110,
    "drat": 3.9,
    "wt": 2.62,
    "qsec": 16.46,
    "vs": 0,
    "am": 1,
    "gear": 4,
    "carb": 4
  },
  {
    "Model": "Mazda RX4 Wag",
    "mpg": 21,
    "cyl": 6,
    "disp": 160,
    "hp": 110,
    "drat": 3.9,
    "wt": 2.875,
    "qsec": 17.02,
    "vs": 0,
    "am": 1,
    "gear": 4,
    "carb": 4
  },
  {
    "Model": "Datsun 710",
    "mpg": 22.8,
    "cyl": 4,
    "disp": 108,
    "hp": 93,
    "drat": 3.85,
    "wt": 2.32,
    "qsec": 18.61,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 1
  },
  {
    "Model": "Hornet 4 Drive",
    "mpg": 21.4,
    "cyl": 6,
    "disp": 258,
    "hp": 110,
    "drat": 3.08,
    "wt": 3.215,
    "qsec": 19.44,
    "vs": 1,
    "am": 0,
    "gear": 3,
    "carb": 1
  },
  {
    "Model": "Hornet Sportabout",
    "mpg": 18.7,
    "cyl": 8,
    "disp": 360,
    "hp": 175,
    "drat": 3.15,
    "wt": 3.44,
    "qsec": 17.02,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 2
  },
  {
    "Model": "Valiant",
    "mpg": 18.1,
    "cyl": 6,
    "disp": 225,
    "hp": 105,
    "drat": 2.76,
    "wt": 3.46,
    "qsec": 20.22,
    "vs": 1,
    "am": 0,
    "gear": 3,
    "carb": 1
  },
  {
    "Model": "Duster 360",
    "mpg": 14.3,
    "cyl": 8,
    "disp": 360,
    "hp": 245,
    "drat": 3.21,
    "wt": 3.57,
    "qsec": 15.84,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 4
  },
  {
    "Model": "Merc 240D",
    "mpg": 24.4,
    "cyl": 4,
    "disp": 146.7,
    "hp": 62,
    "drat": 3.69,
    "wt": 3.19,
    "qsec": 20,
    "vs": 1,
    "am": 0,
    "gear": 4,
    "carb": 2
  },
  {
    "Model": "Merc 230",
    "mpg": 22.8,
    "cyl": 4,
    "disp": 140.8,
    "hp": 95,
    "drat": 3.92,
    "wt": 3.15,
    "qsec": 22.9,
    "vs": 1,
    "am": 0,
    "gear": 4,
    "carb": 2
  },
  {
    "Model": "Merc 280",
    "mpg": 19.2,
    "cyl": 6,
    "disp": 167.6,
    "hp": 123,
    "drat": 3.92,
    "wt": 3.44,
    "qsec": 18.3,
    "vs": 1,
    "am": 0,
    "gear": 4,
    "carb": 4
  },
  {
    "Model": "Merc 280C",
    "mpg": 17.8,
    "cyl": 6,
    "disp": 167.6,
    "hp": 123,
    "drat": 3.92,
    "wt": 3.44,
    "qsec": 18.9,
    "vs": 1,
    "am": 0,
    "gear": 4,
    "carb": 4
  },
  {
    "Model": "Merc 450SE",
    "mpg": 16.4,
    "cyl": 8,
    "disp": 275.8,
    "hp": 180,
    "drat": 3.07,
    "wt": 4.07,
    "qsec": 17.4,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 3
  },
  {
    "Model": "Merc 450SL",
    "mpg": 17.3,
    "cyl": 8,
    "disp": 275.8,
    "hp": 180,
    "drat": 3.07,
    "wt": 3.73,
    "qsec": 17.6,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 3
  },
  {
    "Model": "Merc 450SLC",
    "mpg": 15.2,
    "cyl": 8,
    "disp": 275.8,
    "hp": 180,
    "drat": 3.07,
    "wt": 3.78,
    "qsec": 18,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 3
  },
  {
    "Model": "Cadillac Fleetwood",
    "mpg": 10.4,
    "cyl": 8,
    "disp": 472,
    "hp": 205,
    "drat": 2.93,
    "wt": 5.25,
    "qsec": 17.98,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 4
  },
  {
    "Model": "Lincoln Continental",
    "mpg": 10.4,
    "cyl": 8,
    "disp": 460,
    "hp": 215,
    "drat": 3,
    "wt": 5.424,
    "qsec": 17.82,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 4
  },
  {
    "Model": "Chrysler Imperial",
    "mpg": 14.7,
    "cyl": 8,
    "disp": 440,
    "hp": 230,
    "drat": 3.23,
    "wt": 5.345,
    "qsec": 17.42,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 4
  },
  {
    "Model": "Fiat 128",
    "mpg": 32.4,
    "cyl": 4,
    "disp": 78.7,
    "hp": 66,
    "drat": 4.08,
    "wt": 2.2,
    "qsec": 19.47,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 1
  },
  {
    "Model": "Honda Civic",
    "mpg": 30.4,
    "cyl": 4,
    "disp": 75.7,
    "hp": 52,
    "drat": 4.93,
    "wt": 1.615,
    "qsec": 18.52,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 2
  },
  {
    "Model": "Toyota Corolla",
    "mpg": 33.9,
    "cyl": 4,
    "disp": 71.1,
    "hp": 65,
    "drat": 4.22,
    "wt": 1.835,
    "qsec": 19.9,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 1
  },
  {
    "Model": "Toyota Corona",
    "mpg": 21.5,
    "cyl": 4,
    "disp": 120.1,
    "hp": 97,
    "drat": 3.7,
    "wt": 2.465,
    "qsec": 20.01,
    "vs": 1,
    "am": 0,
    "gear": 3,
    "carb": 1
  },
  {
    "Model": "Dodge Challenger",
    "mpg": 15.5,
    "cyl": 8,
    "disp": 318,
    "hp": 150,
    "drat": 2.76,
    "wt": 3.52,
    "qsec": 16.87,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 2
  },
  {
    "Model": "AMC Javelin",
    "mpg": 15.2,
    "cyl": 8,
    "disp": 304,
    "hp": 150,
    "drat": 3.15,
    "wt": 3.435,
    "qsec": 17.3,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 2
  },
  {
    "Model": "Camaro Z28",
    "mpg": 13.3,
    "cyl": 8,
    "disp": 350,
    "hp": 245,
    "drat": 3.73,
    "wt": 3.84,
    "qsec": 15.41,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 4
  },
  {
    "Model": "Pontiac Firebird",
    "mpg": 19.2,
    "cyl": 8,
    "disp": 400,
    "hp": 175,
    "drat": 3.08,
    "wt": 3.845,
    "qsec": 17.05,
    "vs": 0,
    "am": 0,
    "gear": 3,
    "carb": 2
  },
  {
    "Model": "Fiat X1-9",
    "mpg": 27.3,
    "cyl": 4,
    "disp": 79,
    "hp": 66,
    "drat": 4.08,
    "wt": 1.935,
    "qsec": 18.9,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 1
  },
  {
    "Model": "Porsche 914-2",
    "mpg": 26,
    "cyl": 4,
    "disp": 120.3,
    "hp": 91,
    "drat": 4.43,
    "wt": 2.14,
    "qsec": 16.7,
    "vs": 0,
    "am": 1,
    "gear": 5,
    "carb": 2
  },
  {
    "Model": "Lotus Europa",
    "mpg": 30.4,
    "cyl": 4,
    "disp": 95.1,
    "hp": 113,
    "drat": 3.77,
    "wt": 1.513,
    "qsec": 16.9,
    "vs": 1,
    "am": 1,
    "gear": 5,
    "carb": 2
  },
  {
    "Model": "Ford Pantera L",
    "mpg": 15.8,
    "cyl": 8,
    "disp": 351,
    "hp": 264,
    "drat": 4.22,
    "wt": 3.17,
    "qsec": 14.5,
    "vs": 0,
    "am": 1,
    "gear": 5,
    "carb": 4
  },
  {
    "Model": "Ferrari Dino",
    "mpg": 19.7,
    "cyl": 6,
    "disp": 145,
    "hp": 175,
    "drat": 3.62,
    "wt": 2.77,
    "qsec": 15.5,
    "vs": 0,
    "am": 1,
    "gear": 5,
    "carb": 6
  },
  {
    "Model": "Maserati Bora",
    "mpg": 15,
    "cyl": 8,
    "disp": 301,
    "hp": 335,
    "drat": 3.54,
    "wt": 3.57,
    "qsec": 14.6,
    "vs": 0,
    "am": 1,
    "gear": 5,
    "carb": 8
  },
  {
    "Model": "Volvo 142E",
    "mpg": 21.4,
    "cyl": 4,
    "disp": 121,
    "hp": 109,
    "drat": 4.11,
    "wt": 2.78,
    "qsec": 18.6,
    "vs": 1,
    "am": 1,
    "gear": 4,
    "carb": 2
  }
] 
```

---
class: left, middle, inverse

# Subject, Predicate, Object


```
&lt;mtcars:24&gt; &lt;mtcars:wt&gt; "3.84"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:wt&gt; "3.15"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:hp&gt; "245"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:Model&gt; "Lincoln Continental" .
&lt;mtcars:12&gt; &lt;mtcars:mpg&gt; "16.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:wt&gt; "2.32"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:hp&gt; "65"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:qsec&gt; "18.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:disp&gt; "160"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:drat&gt; "3.77"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:disp&gt; "71.1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:hp&gt; "97"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:qsec&gt; "17.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:drat&gt; "3.07"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:qsec&gt; "19.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:disp&gt; "318"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:disp&gt; "121"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:wt&gt; "3.17"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:drat&gt; "4.08"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:Model&gt; "Merc 450SLC" .
&lt;mtcars:3&gt; &lt;mtcars:mpg&gt; "22.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:drat&gt; "3.08"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:hp&gt; "215"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:mpg&gt; "15.5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:Model&gt; "Toyota Corona" .
&lt;mtcars:23&gt; &lt;mtcars:wt&gt; "3.435"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:Model&gt; "Dodge Challenger" .
&lt;mtcars:27&gt; &lt;mtcars:hp&gt; "91"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:hp&gt; "66"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:carb&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:disp&gt; "145"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:gear&gt; "5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:qsec&gt; "17.98"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:qsec&gt; "17.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:disp&gt; "275.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:qsec&gt; "16.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:drat&gt; "3.62"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:wt&gt; "5.345"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:disp&gt; "78.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:disp&gt; "160"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:wt&gt; "3.73"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:hp&gt; "123"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:Model&gt; "Merc 230" .
&lt;mtcars:12&gt; &lt;mtcars:carb&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:qsec&gt; "17.02"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:mpg&gt; "14.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:mpg&gt; "21"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:wt&gt; "2.77"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:Model&gt; "Ferrari Dino" .
&lt;mtcars:19&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:Model&gt; "Merc 450SE" .
&lt;mtcars:2&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:drat&gt; "4.22"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:disp&gt; "167.6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:qsec&gt; "18.6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:disp&gt; "350"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:wt&gt; "3.57"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:drat&gt; "4.43"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:qsec&gt; "14.6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:hp&gt; "110"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:wt&gt; "3.57"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:drat&gt; "3.69"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:Model&gt; "Porsche 914-2" .
&lt;mtcars:1&gt; &lt;mtcars:wt&gt; "2.62"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:drat&gt; "4.11"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:hp&gt; "110"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:drat&gt; "3.85"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:qsec&gt; "18.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:Model&gt; "Fiat X1-9" .
&lt;mtcars:31&gt; &lt;mtcars:mpg&gt; "15"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:Model&gt; "Merc 450SL" .
&lt;mtcars:3&gt; &lt;mtcars:Model&gt; "Datsun 710" .
&lt;mtcars:1&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:mpg&gt; "30.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:drat&gt; "4.08"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:Model&gt; "Chrysler Imperial" .
&lt;mtcars:15&gt; &lt;mtcars:mpg&gt; "10.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:drat&gt; "3.07"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:mpg&gt; "32.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:mpg&gt; "21.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:carb&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:mpg&gt; "19.2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:drat&gt; "3.07"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:hp&gt; "110"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:mpg&gt; "15.2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:wt&gt; "3.52"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:hp&gt; "150"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:hp&gt; "93"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:gear&gt; "5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:drat&gt; "2.93"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:mpg&gt; "15.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:qsec&gt; "14.5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:gear&gt; "5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:qsec&gt; "15.41"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:qsec&gt; "17.05"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:hp&gt; "123"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:qsec&gt; "17.82"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:hp&gt; "175"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:mpg&gt; "10.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:Model&gt; "Camaro Z28" .
&lt;mtcars:25&gt; &lt;mtcars:wt&gt; "3.845"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:hp&gt; "335"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:drat&gt; "3.15"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:qsec&gt; "22.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:wt&gt; "1.513"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:hp&gt; "180"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:disp&gt; "108"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:qsec&gt; "16.46"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:Model&gt; "Cadillac Fleetwood" .
&lt;mtcars:22&gt; &lt;mtcars:qsec&gt; "16.87"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:Model&gt; "Toyota Corolla" .
&lt;mtcars:9&gt; &lt;mtcars:drat&gt; "3.92"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:hp&gt; "175"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:hp&gt; "180"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:drat&gt; "3.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:gear&gt; "5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:hp&gt; "105"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:gear&gt; "5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:wt&gt; "5.25"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:disp&gt; "351"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:drat&gt; "3.92"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:wt&gt; "5.424"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:Model&gt; "Volvo 142E" .
&lt;mtcars:23&gt; &lt;mtcars:drat&gt; "3.15"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:Model&gt; "Maserati Bora" .
&lt;mtcars:28&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:mpg&gt; "33.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:wt&gt; "4.07"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:hp&gt; "175"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:drat&gt; "3.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:qsec&gt; "15.5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:disp&gt; "460"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:disp&gt; "304"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:disp&gt; "95.1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:Model&gt; "Mazda RX4 Wag" .
&lt;mtcars:14&gt; &lt;mtcars:qsec&gt; "18"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:disp&gt; "140.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:Model&gt; "Pontiac Firebird" .
&lt;mtcars:31&gt; &lt;mtcars:drat&gt; "3.54"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:wt&gt; "2.875"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:mpg&gt; "13.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:mpg&gt; "17.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:mpg&gt; "14.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:mpg&gt; "15.2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:Model&gt; "Honda Civic" .
&lt;mtcars:7&gt; &lt;mtcars:drat&gt; "3.21"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:mpg&gt; "24.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:hp&gt; "205"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:mpg&gt; "22.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:hp&gt; "264"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:hp&gt; "52"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:drat&gt; "4.22"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:qsec&gt; "20.22"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:qsec&gt; "17.6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:drat&gt; "3.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:disp&gt; "75.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:qsec&gt; "20"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:wt&gt; "1.835"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:disp&gt; "440"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:qsec&gt; "18.61"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:hp&gt; "245"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:qsec&gt; "18.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:mpg&gt; "19.2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:wt&gt; "1.935"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:hp&gt; "62"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:drat&gt; "4.93"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:wt&gt; "2.465"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:wt&gt; "2.2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:Model&gt; "Merc 240D" .
&lt;mtcars:12&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:Model&gt; "Lotus Europa" .
&lt;mtcars:26&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:mpg&gt; "27.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:hp&gt; "109"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:disp&gt; "360"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:disp&gt; "275.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:wt&gt; "1.615"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:drat&gt; "2.76"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:wt&gt; "3.44"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:drat&gt; "2.76"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:14&gt; &lt;mtcars:carb&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:disp&gt; "120.3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:mpg&gt; "18.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:disp&gt; "400"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:drat&gt; "3.92"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:Model&gt; "Duster 360" .
&lt;mtcars:17&gt; &lt;mtcars:qsec&gt; "17.42"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:mpg&gt; "30.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:mpg&gt; "21.5"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:Model&gt; "Merc 280C" .
&lt;mtcars:16&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:wt&gt; "3.19"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:qsec&gt; "17.02"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:drat&gt; "3.73"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:qsec&gt; "19.44"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:drat&gt; "3.23"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:drat&gt; "3.08"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:hp&gt; "66"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:mpg&gt; "18.1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:qsec&gt; "18.52"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:wt&gt; "2.78"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:Model&gt; "Hornet 4 Drive" .
&lt;mtcars:8&gt; &lt;mtcars:disp&gt; "146.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:Model&gt; "Ford Pantera L" .
&lt;mtcars:14&gt; &lt;mtcars:wt&gt; "3.78"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:disp&gt; "301"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:cyl&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:disp&gt; "167.6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:mpg&gt; "19.7"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:carb&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:8&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:hp&gt; "113"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:Model&gt; "Valiant" .
&lt;mtcars:4&gt; &lt;mtcars:wt&gt; "3.215"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:disp&gt; "360"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:disp&gt; "120.1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:mpg&gt; "21"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:32&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:7&gt; &lt;mtcars:qsec&gt; "15.84"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:13&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:qsec&gt; "19.47"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:Model&gt; "Fiat 128" .
&lt;mtcars:21&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:21&gt; &lt;mtcars:qsec&gt; "20.01"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:18&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:mpg&gt; "26"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:disp&gt; "258"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:2&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:Model&gt; "Hornet Sportabout" .
&lt;mtcars:10&gt; &lt;mtcars:wt&gt; "3.44"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:9&gt; &lt;mtcars:hp&gt; "95"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:Model&gt; "AMC Javelin" .
&lt;mtcars:12&gt; &lt;mtcars:disp&gt; "275.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:31&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:26&gt; &lt;mtcars:disp&gt; "79"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:3&gt; &lt;mtcars:vs&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:10&gt; &lt;mtcars:Model&gt; "Merc 280" .
&lt;mtcars:17&gt; &lt;mtcars:hp&gt; "230"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:19&gt; &lt;mtcars:carb&gt; "2"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:23&gt; &lt;mtcars:am&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:5&gt; &lt;mtcars:wt&gt; "3.44"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:disp&gt; "225"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:1&gt; &lt;mtcars:Model&gt; "Mazda RX4" .
&lt;mtcars:11&gt; &lt;mtcars:mpg&gt; "17.8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:cyl&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:12&gt; &lt;mtcars:hp&gt; "180"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:16&gt; &lt;mtcars:drat&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:11&gt; &lt;mtcars:gear&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:6&gt; &lt;mtcars:wt&gt; "3.46"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:4&gt; &lt;mtcars:mpg&gt; "21.4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:cyl&gt; "8"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:30&gt; &lt;mtcars:carb&gt; "6"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:20&gt; &lt;mtcars:am&gt; "1"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:29&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:28&gt; &lt;mtcars:qsec&gt; "16.9"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:25&gt; &lt;mtcars:gear&gt; "3"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:24&gt; &lt;mtcars:vs&gt; "0"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:15&gt; &lt;mtcars:disp&gt; "472"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:17&gt; &lt;mtcars:carb&gt; "4"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:22&gt; &lt;mtcars:hp&gt; "150"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
&lt;mtcars:27&gt; &lt;mtcars:wt&gt; "2.14"^^&lt;http://www.w3.org/2001/XMLSchema#decimal&gt; .
```

---
class: left, top, inverse

# Triples

---
class: center, middle, inverse
background-image: url(img/no-data-lake.jpg)

# Into the Lake: Data Frames


```r
triplestore &lt;- rdf()

as_rdf(mtcars, triplestore, "mtcars:")
as_rdf(iris, triplestore, "iris:")
```


---
class: left, middle, inverse
background-image: url(img/no-data-lake.jpg)

# Into the Lake: Lists

Example JSON data returned from the [GitHub API](https://api.github.com/users/cboettig/events)


```
[
  {
    "id": "7353780009",
    "type": "CreateEvent",
    "actor": {
      "id": 222586,
      "login": "cboettig",
      "display_login": "cboettig",
      "gravatar_id": "",
      "url": "https://api.github.com/users/cboettig",
      "avatar_url": "https://avatars.githubusercontent.com/u/222586?"
    },
    "repo": {
      "id": 124477112,
      "name": "cboettig/test",
      "url": "https://api.github.com/repos/cboettig/test"
    },
    "payload": {
      "ref": null,
      "ref_type": "repository",
```


---
class: left, middle, inverse
background-image: url(img/no-data-lake.jpg)

# Into the Lake: Lists


```r
events &lt;- read_json("https://api.github.com/users/cboettig/events")
```

```r
as_rdf(events, triplestore, "gh:")
```


---
class: left, middle

# Schema on read: SPARQL


```r
rdf_query(triplestore,
'SELECT  ?Model ?mpg ?cyl ?disp  ?hp
WHERE {
 ?s &lt;mtcars:Model&gt;  ?Model ;
    &lt;mtcars:mpg&gt;  ?mpg ;
    &lt;mtcars:cyl&gt;  ?cyl ; 
    &lt;mtcars:disp&gt;  ?disp ;
    &lt;mtcars:hp&gt;  ?hp 
}')
```

---
class: left, middle

# Schema on read: SPARQL


```
# A tibble: 32 x 5
   Model                 mpg   cyl  disp    hp
   &lt;chr&gt;               &lt;dbl&gt; &lt;int&gt; &lt;dbl&gt; &lt;int&gt;
 1 Merc 230             22.8     4 141.     95
 2 Toyota Corolla       33.9     4  71.1    65
 3 Merc 450SL           17.3     8 276.    180
 4 Fiat 128             32.4     4  78.7    66
 5 Lincoln Continental  10.4     8 460.    215
 6 Merc 450SLC          15.2     8 276.    180
 7 Fiat X1-9            27.3     4  79.0    66
 8 Hornet Sportabout    18.7     8 360.    175
 9 Lotus Europa         30.4     4  95.1   113
10 Valiant              18.1     6 225.    105
# ... with 22 more rows
```


---
class: left, middle

# Data Rectangling


```r
rdf_query(triplestore, 
'SELECT ?type ?user ?repo ?when
WHERE {
?s &lt;gh:type&gt; ?type ;
   &lt;gh:created_at&gt; ?when ;
   &lt;gh:repo&gt; ?repo_id ;
   &lt;gh:actor&gt; ?actor .
?actor &lt;gh:login&gt; ?user .
?repo_id &lt;gh:name&gt; ?repo
}')
```


---
class: left, middle

# Data Rectangling


```
# A tibble: 30 x 4
   type              user     repo                     when               
   &lt;chr&gt;             &lt;chr&gt;    &lt;chr&gt;                    &lt;dttm&gt;             
 1 PushEvent         cboettig cboettig/noise-phenomena 2018-03-06 05:25:07
 2 IssueCommentEvent cboettig rocker-org/shiny         2018-03-08 01:51:57
 3 PushEvent         cboettig cboettig/NetGen          2018-03-08 17:34:09
 4 PushEvent         cboettig cboettig/labnotebook     2018-03-06 05:27:18
 5 IssueCommentEvent cboettig ropensci/jqr             2018-03-07 22:18:46
 6 PushEvent         cboettig ropensci/rdflib          2018-03-08 21:37:14
 7 PushEvent         cboettig cboettig/noise-phenomena 2018-03-05 22:25:31
 8 PushEvent         cboettig cboettig/noise-phenomena 2018-03-06 18:23:51
 9 CreateEvent       cboettig cboettig/popdyn          2018-03-09 02:34:21
10 PushEvent         cboettig cboettig/NetGen          2018-03-08 17:56:38
# ... with 20 more rows
```

---
class: left, middle

# Data Rectangling: Graph Queries


```r
df &lt;- rdf_query(triplestore, 
'SELECT DISTINCT ?property ?value
WHERE {
?s &lt;gh:url&gt; "https://api.github.com/repos/cboettig/noise-phenomena" .
?parent ?p ?s .
?parent ?property ?value
}')
```

---
class: left, middle

# Data Rectangling: Graph Queries


```
# A tibble: 37 x 2
   property      value               
   &lt;chr&gt;         &lt;chr&gt;               
 1 gh:created_at 2018-03-05T22:25:08Z
 2 gh:payload    _:b231              
 3 gh:repo       _:b236              
 4 gh:type       PushEvent           
 5 gh:id         7334335663          
 6 gh:public     true                
 7 gh:actor      _:b230              
 8 gh:created_at 2018-03-05T22:25:31Z
 9 gh:id         7334337582          
10 gh:payload    _:b225              
# ... with 27 more rows
```


---
class: center, middle, inverse

# Potential Issues

- Potential column name or property collisions
- Dealing with data types (numeric, logical, dates, etc)
- Potential row name or object id collisions

---
class: center, middle, inverse

# U say URL
# I say IRI 


---
class: left, middle, inverse

# Internationalized Resource Identifiers


- `https://example.com`
- `https://schema.org/givenName`
- `isbn:978-0-387-98140-6`
- `urn:uuid:0aae8482-93b9-4b22-879e-aa71af0d3fd1`


---
class: center, middle, inverse

# Unique variable/column names

- `https://schema.org/givenName`
- `https://schema.org/programmingLanguage`
- `https://schema.org/softwareRequirements`


---
class: center, middle, inverse

# Data types

- `http://www.w3.org/2001/XMLSchema#decimal`
- `http://www.w3.org/2001/XMLSchema#dateTime`


---
class: center, middle, inverse

# Subject IRIs

- `https://example.com`
- `isbn:978-0-387-98140-6`
- `doi:10.1007/978-0-387-98141-3`
- `_:` Blank nodes

---
class: center, middle, inverse

# Object Types and Resource Nodes

- `https://schema.org/SoftwareSoureCode`
- `doi:10.1007/978-0-387-98141-3`


---
class: center, middle, inverse

# Practical Issues

- `SQL` -&gt; `dplyr`
- `SPARQL` -&gt; `???`


---
class: center, middle, inverse


# Explore &amp; Contribute

- &lt;https://github.com/ropensci/rdflib&gt;
- &lt;https://cran.r-project.org/package=rdflib&gt;
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