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openRDF.org Forum » Sesame & Rio: Open Discussion » Thread: How to create a new parser?

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Aug 29, 2009 9:43:24 PM

bblfish
Sesame Addict

France
Joined: Sep 13, 2004
Posts: 102
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How to create a new parser?

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Hi I am tryihng to adapt shellac's rdfa parser to Sesame. Here is what shellac told me:

Here's some stuff to get you started:

* http://rootdev.net/maven/projects/java-rdfa/ is a bit bare, but has most of the useful info.
* java-rdfa releases are in the maven central repo (net.rootdev java-rdfa). The dependencies are screwy. You'll only really need StAX (for java < 6) and IRI (because java.net.URI is rubbish). I might relax the IRI thing.
* All you need to do is implement StatementSink (http://rootdev.net/maven/projects/java-rdfa/apidocs/net/rootdev/javardfa/StatementSink.html).
* http://rootdev.net/maven/projects/java-rdfa/apidocs/src-html/net/rootdev/javardfa/RDFaReader.html show how to plumb together the parsing:

Take a StatementSink.
Make a Parser using the StatementSink.
Get a SAX XMLReader (I use the jdk one and the html 5 validator.nu parser).
Set the XMLReader's content handler to be the Parser.
parse an InputSource.

That seeed doable, so I started working on it.

The first problem I came accross is: how do I associate an RDFParser with an RDFFormat so that the calls to add triples from an input stream get sent to the correct parser?

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Aug 30, 2009 3:10:44 PM

james
OpenRDF.org Consultant

Canada
Joined: Jul 21, 2005
Posts: 650
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Re: How to create a new parser?

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List your parser factory in a file named:
META-INF/services/org.openrdf.rio.RDFParserFactory

In the getRDFFormat method return a format that was registered with:
RDFFormat.register

Now your parser can be looked up by RDFFormat, mimetype, or file extension.
----------------------------------------
Sesame Consultant
http://leighnet.ca
http://jamesrdf.blogspot.com

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Sep 9, 2009 7:03:31 PM

bblfish
Sesame Addict

France
Joined: Sep 13, 2004
Posts: 102
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Re: How to create a new parser?

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I forked shellac's parser and it is now available online. For more info see:
http://blogs.sun.com/bblfish/entry/rdfa_parser_for_sesame

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