Load data inside the rdflib SPARQL processor

Context

The entry point is at rdflib.graph.Graph.query.

• It can accept a parsed/compiled Query object
  • Seems that it ca be prepared by rdflib.plugins.sparql.processor.prepareQuery
• It can delegate execution to the store, as per use_store_provided argument
• It delegates processing to Processor class

Decision

Load data directly after parsing the SPARQL query in an rdflib SPARQL processor class.

Consequences

Pro:

• Easy to write.

Contra:

• Will not work for an IRI that is not specified explicitly in the query but retrieved from the graph as a variable. This defies a stand-alone Cyberspace querying command, but is enough for the iolanta browser, where most queries explicitly specify the variables.