Add SPARQL DESCRIBE query implementation #2221
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Just for reference, two previous abandoned attempts at doing this: |
aucampia
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@mgberg thanks for the PR, it looks great as always, I just have a question regarding the change in rdflib/plugins/sparql/parser.py which I'm not entirely clear on.
The change should also be pretty safe as nothing should impact non-describe queries.
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SPARQL DESCRIBE was implemented in <RDFLib#2221> so there should be no xfail on it tests for it. This change removes one such xfail that was in place.
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SPARQL DESCRIBE was implemented in <#2221> so there should be no `xfail` on it tests for it. This change removes one such `xfail` that was in place.
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Summary of changes
This adds an implementation for SPARQL DESCRIBE queries, using the built-in
cbdmethod. I see there are several issues and PRs for DESCRIBE implementation. I believe this should close #479 and should resolve #1913, or at least pick up where it left off. It should also resolve #1096.This implementation should support the full SPARQL specification for DESCRIBE; either explicit IRIs can be provided (with no WHERE clause), or variables projected from a WHERE clause can be provided, or variables projected from a WHERE clause AND explicit IRIs can be provided. If a WHERE clause is provided, it should be evaluated the same way as it would for a SELECT DISTINCT query (including dataset specifications).
The expected results for the test cases provided match the behavior seen when running the same queries against the same data using ARQ.
A possible future extension would be to add a global option (similar to
rdflib.plugins.sparql.SPARQL_LOAD_GRAPHS) to change the method used to describe resources instead of always using CBD.Checklist
the same change.
./examplesfor new features.CHANGELOG.md).so maintainers can fix minor issues and keep your PR up to date.