Turtle serializer: @base directive isn't added

[danmichaelo]

When doing graph.serialize(stream, base='...'), the @base directive isn't added.

I found a mention of this in #248 (comment) by @gromgull :

I left it without @base directive now - this way you can quickly and easily 'rebase' some triples.

but I find this slightly counterintuitive.

[lrowe]

Neither is xml:base added when serializing as xml:

>>> g = rdflib.Graph()
>>> g.add((rdflib.URIRef('http://example.com/foo'), rdflib.URIRef('http://example.com/term'), rdflib.URIRef('http://example.com/bar')))
>>> print(g.serialize(format='xml', base='http://example.com').decode('utf-8'))
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
   xmlns:ns1="http://example.com/"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>
  <rdf:Description rdf:about="/foo">
    <ns1:term rdf:resource="/bar"/>
  </rdf:Description>
</rdf:RDF>

[wikier]

any update on this?

[chrysn]

i do see use cases where having @base would be good (for readability and compactness), but there are use cases when i very much prefer it not to be explicit, namely all situations in which statements are created by reasoning about local files and then exported in a http:// and not a file:// context.

if this issue does get fixed, i suggest that @base only gets added to the turtle serialization if an explicit_base=True argument is present.

[bhavye9499]

Hi...Can I work this issue? It seems pretty straightforward. I would love to communicate with the maintainers regarding the same.

[white-gecko]

If there are no objections to adding this feature, maybe as @chrysn suggests, you are welcome. We are happy about any pull-request helping us to fix bugs. We will have to see in which milestone it will be released.

[achaudhary997]

This issue seems to have been fixed. rdflib version 5.0

>>> from rdflib import graph
>>> g = rdflib.Graph()
>>> g.add((rdflib.URIRef('http://example.com/foo'), rdflib.URIRef('http://example.com/term'), rdflib.URIRef('http://example.com/bar')))
>>> print(g.serialize(format='ttl', base='http://example.com').decode('utf-8'))
@base <http://example.com> .
@prefix ns1: <http://example.com/> .

</foo> ns2:term ns2:bar .

[ghost]

As observed by achaudhary997, no longer an issue