NELL2RDF is a tool to convert NELL data and metadata into RDF using different annotation approaches. It takes as input the ontology and data files provided by NELL (http://rtw.ml.cmu.edu/rtw/resources) and produces as output separated files for them.
In order to compile NELL2RDF into an executable jar file run mvn clean package. It will create the file NellConverter-0.0.1-SNAPSHOT.jar in the target folder.
Once compiled, run the executable jar file using the java command as following:
java -jar NellConverter-0.0.1-SNAPSHOT.jar FORMAT MODEL IONTOLOGY OONTOLOGY IDATA ODATA [DELETE]
Where each parameter stands for the following:
FORMAT Desired serialization format: "RDF/XML", "RDF/XML-ABBREV", "N-TRIPLE", "TURTLE", "TTL", "N3"
MODEL Desired model to represent meta-data: "none", "reification", "n-ary", "quads", "singleton-property"
IONTOLOGY Absolute path to nell csv ontology file. E.g., "./NELL.08m.1075.ontology.csv"
OONTOLOGY Absolute path where to serialize the RDF model., E.g. "./NELL.08m.1075.ontology.ttl"
IDATA Absolute path to nell csv instance file. E.g., "./NELL.08m.1070.cesv.csv"
ODATA Absolute path where to serialize the RDF instances. E.g., "./NELL.08m.1070.cesv.ttl"
DELETE Whether to delete original triple (optional, true by default, not applicable for quads)
The execution generates an independent set of triples for each line of the data file. Hence, it can produce duplicate triples in case the same triple is generated by different lines.
In order to facilitate the automatic generation of the data we include a bash script that takes as input the paths to the ontology, promoted, and candidates files and generates the output files for the three of them using all annotation models, removing duplicate triples. The file is located in src/main/resources/nell2rdf.sh. To run it use the following syntax:
./nell2rdf.sh [OPTION]* ONTOLOGY PROMOTED CANDIDATES
OPTIONS:
-c, --compress compress the output in the desired format (gzip|bzip|lzop)
-f, --format serialization format to encode the RDF triples (default N-TRIPLES)
(RDF/XML | RDF/XML-ABBREV | N-TRIPLE | TURTLE | TTL | N3 )
-h, --help shows this help and exists
-j, --jar path to NELL2RDF java jar file (default $jarFile)
-p, --params parameters for java command (e.g., -Xmx10g)
ONTOLOGY path to NELL's ontology file
PROMOTED path to NELL's promoted beliefs file
CANDIDATES path to NELL's candidates file