rdf4h is a library for working with RDF in Haskell.
For details see the GitHub project page:
http://robstewart57.github.io/rdf4h/
The coverage of the W3C RDF standards are:
| Format | Parsing | Serialising |
|---|---|---|
| NTriples | complete | complete |
| Turtle | complete | complete |
| RDF/XML | partial (115/162 W3C tests) | not supported |
These results are produced with version 3.1.0 of this library.
These tests are run on the W3C unit tests for RDF formats: https://github.com/w3c/rdf-tests.
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Pull requests are welcome to fix the remaining W3C RDF/XML parser bugs. The xmlbf branch is working on a reimplementation of the XmlParser module with the xmlbf library.
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The parsers in this library parse large files/strings contents entirely before generating RDF triples. This doesn't scale for very large files. Implementing stream based RDF parsers would overcome this problem, e.g. by creating input streams enabling output streams in the io-streams library to consume triples on-the-fly during parsing. This is discussed here: robstewart57#44 (comment)
To run all the tests (parsers and the library API):
$ git submodule update --init --recursive
$ git submodule foreach git pull origin gh-pages
$ stack test --test-arguments="--quickcheck-tests 1000"To run specific parser tests when bug fixing:
$ stack test --test-arguments="--pattern /parser-w3c-tests-ntriples/"
$ stack test --test-arguments="--pattern /parser-w3c-tests-turtle/"
$ stack test --test-arguments="--pattern /parser-w3c-tests-xml/"To run the bencharks:
$ wget https://www.govtrack.us/data/rdf/bills.099.actions.rdf.gz
$ gzip -d bills.099.actions.rdf.gz
$ stack bench