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Support <bnode:> SPARQL extension in plugins.stores.sparqlstore #511

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ssssam opened this issue Aug 22, 2015 · 1 comment
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Support <bnode:> SPARQL extension in plugins.stores.sparqlstore #511

ssssam opened this issue Aug 22, 2015 · 1 comment
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enhancement New feature or request SPARQL store Related to a store.
Milestone
rdflib 4.2.2

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@ssssam
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ssssam commented Aug 22, 2015

Hello!
Right now the 'plugins.stores.sparqlstore' module has a big warning saying "The SPARQL Store does not support blank-nodes!" because they can't be expressed in SPARQL.

Playing with the 4Store triple store, I've found that it does actually let you represent blank nodes in SPARQL by using a special URI form, like this: <bnode:b000012>

In the process of getting the rdflib-web module to browse a 4Store triple store using the 'plugins.stores.sparqlstore' module, I hacked support for these blank nodes into the code, and it seems to be working fine. Without this change, rdflib-web can't be used on my data, it raises an exception as soon as it starts due to there being blank nodes in the data.

I noticed that the sparqlstore constructor takes a 'bNodeAsURI' flag which is completely unused, I thought maybe this is what it's meant for so I used that as a way of enabling this functionality.
@ssssam ssssam mentioned this issue Aug 22, 2015
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@joernhees joernhees added enhancement New feature or request SPARQL store Related to a store. labels Aug 23, 2015
@joernhees joernhees added this to the rdflib 4.2.2 milestone Aug 23, 2015
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see #512 for further discussion

@ssssam ssssam mentioned this issue Aug 26, 2015
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joernhees added a commit to joernhees/rdflib that referenced this issue Mar 9, 2016
@joernhees
improved SPARQLStore BNode customizability
33cb2a8 
initBindings, contexts, addN, remove, add_graph and remove_graph now call the
node_to_sparql customizable function. Some support for BNode graph names added.

Add-on for RDFLib#513, see also RDFLib#511, RDFLib#512
joernhees added a commit to joernhees/rdflib that referenced this issue Mar 9, 2016
@joernhees
improved SPARQLStore BNode customizability
c1a6dbd 
query (initBindings), contexts, addN, remove, add_graph and remove_graph now call
node_to_sparql. Some support for BNode graph names added.

Add-on for RDFLib#513, see also RDFLib#511, RDFLib#512
@joernhees joernhees mentioned this issue Mar 9, 2016
Merged
joernhees added a commit to joernhees/rdflib that referenced this issue Mar 9, 2016
@joernhees
improved SPARQLStore BNode customizability
77e9b70 
query (initBindings), contexts, addN, remove, add_graph and remove_graph now call
node_to_sparql. Some support for BNode graph names added.

Add-on for RDFLib#513, see also RDFLib#511, RDFLib#512
@pyup-bot pyup-bot mentioned this issue Jan 29, 2017
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This was referenced Mar 16, 2017
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enhancement New feature or request SPARQL store Related to a store.
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rdflib 4.2.2
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