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N-Sam: A Lightweight N3 Parser in Java

1. Introduction

N-Sam is a small parser, written in Java, for parsing N3 files. N-Sam has no problem with typical N3 documents that include RDF and OWL sentences, but some complex constructs like embedded formulas and built-ins are not recognized.

2. A Basic Usage

A basic usage of N-Sam parser is as follows:

            ...
            String url = "file:///usr/etc/sample.n3";
            NSam parser = new NSam();
            StatementHandler h = new StatementHandlerImpl();
            parser.setStatementHandler(h);
            parser.read(url);
            ...

Parsed N3 constructs are notified via StatementHandler interface. StatementHandler includes the following notification methods:

void statement(Stirng subject, String predicate, String object, String objectType);
void prefix(String prefix, String uri);
void startFormula();
void endFormula();
void formulaConnector(String connector);

Details on the methods are provided as javadoc comments in the code.

3. Validation

N3 successfully parsed the following N3 documents:

http://www.agfa.com/w3c/euler/owl-rules.n3
http://www.w3.org/2000/10/swap/test/lists-simple.n3
http://www.w3.org/2002/03owlt/sameGuyC.n3
http://www.w3.org/2002/03owlt/sameGuyP.n3
http://www.w3.org/2002/03owlt/sameGuyR.n3
http://www.w3.org/2002/03owlt/sameGuyQ.n3
http://www.w3.org/2002/03owlt/sameGuyQR.n3
http://www.w3.org/2002/03owlt/sameGuyT.n3
http://www.w3.org/2002/03owlt/sameStateC.n3
http://www.w3.org/2002/03owlt/dbC.n3
http://www.w3.org/2002/03owlt/dbP.n3
http://www.w3.org/2002/03owlt/sameStateP.n3
http://www.w3.org/2002/03owlt/sem-intersectionC.n3
http://www.w3.org/2002/03owlt/unionOfC.n3
http://www.w3.org/2002/03owlt/unionOfP.n3
http://www.agfa.com/w3c/euler/danb.n3
http://www.agfa.com/w3c/euler/ziv.n3
http://www.agfa.com/w3c/euler/animal.n3
http://www.agfa.com/w3c/euler/gedcom-facts.n3
http://www.w3.org/2000/10/swap/test/s1.n3
http://www.agfa.com/w3c/euler/owl-facts.n3

And N3 failed with the following documents:

http://www.w3.org/2002/03owlt/sameStateR.n3
http://www.w3.org/2002/03owlt/sem-intersectionR.n3
http://www.w3.org/2000/10/swap/test/resolves-rdf.n3
http://www.w3.org/2000/10/swap/test/contexts.n3
http://www.w3.org/2000/10/swap/test/includes/quantifiers.n3
http://dev.w3.org/cvsweb/~checkout~/2000/10/swap/test/ref/strquot.n3

written by zebehn(minsu.jang (at) me.com)