157 lines
4.8 KiB
HTML
157 lines
4.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<html>
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<head>
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<title>Online SWI-Prolog RDF parser demo</title>
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</head>
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<body>
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<h1 align=center>Online SWI-Prolog RDF parser demo</h1>
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<p>
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This page provides an online demonstration of an RDF parser written in
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<a href="http://www.swi.psy.uva.nl/projects/SWI-Prolog/">SWI-Prolog</a>.
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This RDF parser has a couple of attractive properties:
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<dl>
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<dt><b>Small</b><dd>
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Both in terms of source-code (< 700 lines) and executable.
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<dt><b>Fast</b><dd>
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Parses about 400 Kbytes/sec on a Pentium-II/450.
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<dt><b>Conforming</b><dd>
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This parser conforms to <a href="http://www.w3.org/TR/REC-rdf-syntax">
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http://www.w3.org/TR/REC-rdf-syntax</a>.
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<dt><b>Prolog based</b><dd>
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Many people regard the Prolog programming language a good vehicle to
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reason about RDF statements. Having a simple and fast Prolog-based RDF
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parser makes life easier.
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<dt><b>Portability</b><dd>
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The RDF parser itself is written in ISO Prolog. The XML parser is
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written in ANSI-C. There is no standard for interfacing Prolog and C,
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but the interface is relatively small.
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</dl>
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A more detailed description of this packages is available in <a
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href="rdf2pl.html">in this document</a>. The sources of the parser are
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included into the <a
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href="http://www.swi.psy.uva.nl/projects/SWI-Prolog/packages/sgml/">sgml</a>
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packages for SWI-Prolog. The individual source files can also be
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examined through the <a
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href="http://gollem.swi.psy.uva.nl/cgi-bin/pl-cvsweb/packages/sgml/RDF">
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cvsweb service</a>, which also provides access to the most recent
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<a
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href="http://gollem.swi.psy.uva.nl/cgi-bin/pl-cvsweb/packages/sgml/RDF/ChangeLog">
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changes</a>
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<p>
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<hr>
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Please write your RDF description into the text-area below or select a
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local file using the <b>File:</b> item and submit it. If anything goes
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wrong, please mail <a href="mailto:jan@swi.psy.uva.nl">Jan
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Wielemaker</a>.
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<p>
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<em>The RDF-data submitted is kept <b>anonymously</b> on our server and
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might be used by us to examine problems with our RDF parser. We do not
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publish this material.</em> The result-page provides a form for
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attaching a comment to the stored RDF statement.
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<!-- enctype="multipart/form-data" -->
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<p>
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<form
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name=rdf
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method=get
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action="http://localhost:8000/rdf">
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<table align=center>
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<tr><td colspan=2>
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<textarea name=rdf rows=15 cols=72 wrap=off></textarea>
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<tr><td>File: <input name=attachment type=file>
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<td align=right>
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<input type=button value='Example 1' onClick="ex1()">
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<input type=button value='Example 2' onClick="ex2()">
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<input type=button value='Example 3' onClick="ex3()">
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<tr><td align=left><input type=reset value="Clear Text">
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<td align=right><input type=submit value="Parse RDF">
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</table>
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</form>
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<h4><hr>Notes<hr></h4
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<dl>
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<dt><b><em>rdf:</em>resource, etc.</b><dd>
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The specification and discussion on the rdf interest group yielded no
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satisfactory solution how to deal with RDF attributes that are not in
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the RDF namespace such as <b>ID</b>, <b>resource</b>, etc. This parser
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interprets such attributes in the namespace of the element, so the
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statement below is not interpreted as a <b>propertyElt</b> with value
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<code>me</code> but as a <b>typedNode</b> with predicate
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<code>resource</code> and value <b>literal(</b>me<b>)</b>.
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<pre>
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<s:Creator resource="#me">
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</pre>
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</dl>
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<!---------------------------------------------------------------->
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<!-- EXAMPLES -->
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<!---------------------------------------------------------------->
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<script language="JavaScript">
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function ex1()
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{ document.rdf.rdf.value='<?xml version="1.0"?>\
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\
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<!-- Example from REC-rdf-syntax -->\
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\
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
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xmlns:s="http://description.org/schema/">\
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<rdf:Description about="http://www.w3.org/Home/Lassila">\
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<s:Creator>Ora Lassila</s:Creator>\
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</rdf:Description>\
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</rdf:RDF>';
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}
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function ex2()
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{ document.rdf.rdf.value='<?xml version="1.0"?>\
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\
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<!-- Example from REC-rdf-syntax, demonstrating reification -->\
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\
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<rdf:RDF\
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xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
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xmlns:s="http://description.org/schema/">\
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<rdf:Description about="http://www.w3.org/Home/Lassila" bagID="D_001">\
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<s:Creator>Ora Lassila</s:Creator>\
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<s:Title>Ora\'s Home Page</s:Title>\
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</rdf:Description>\
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</rdf:RDF>';
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}
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function ex3()
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{ document.rdf.rdf.value='<?xml version="1.0"?>\
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\
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<!-- Example from REC-rdf-syntax, non-binary relations -->\
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\
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<RDF\
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xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
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xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
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xmlns:n="http://www.nist.gov/units/">\
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<Description about="John_Smith">\
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<n:weight rdf:parseType="Resource">\
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<rdf:value>200</rdf:value>\
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<n:units rdf:resource="http://www.nist.gov/units/Pounds"/>\
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</n:weight>\
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</Description>\
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</RDF>';
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}
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</script>
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</body>
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</html>
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