Experiment with porting SGML to YAP, and trying to preserve SWI code as much
as possible.
This commit is contained in:
Vitor Santos Costa
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packages/sgml/RDF/online.html
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packages/sgml/RDF/online.html
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<!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 <a
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href="http://www.swi-prolog.org">SWI-Prolog</a> and distributed as part of the
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normal SWI-Prolog distribution. This RDF parser has a couple of attractive
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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 (< 1200 lines) and executable.
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<dt><b>Fast</b><dd>
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Parses about 1.2 Mbytes/sec on an AMD 1600+ running SWI-Prolog 5.1.6 and
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SuSE Linux 8.1 (tested on a 9MB RDFS file containing 179403 triples).
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<dt><b>Conforming</b><dd>
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This parser conforms to http://www.w3.org/TR/rdf-syntax-grammar/,
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W3C Working Draft 8 November 2002. It includes the revised bag
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syntax, <code>xml:base</code>, <code>parseType="Collection"</code>
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and <code>nodeID</code> features.
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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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<dt><b>Discussion Page</b><dd>
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There is a
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<a href="http://gollem.science.uva.nl/twiki/pl/bin/view/Library/RdfParse">
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discussion page</a> on this parser on the SWI-Prolog collaborative
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(<em>twiki</em> web) </dl>
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A more detailed description of this packages is available in <a
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href="http://www.swi-prolog.org/packages/rdf2pl.html">in this
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document</a>. The sources of the parser are included in the full
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source 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.science.uva.nl/cgi-bin/pl-cvsweb/pl/packages/sgml/RDF">
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cvsweb service</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:wielemak@science.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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<p>
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<form
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name=rdf
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method=post
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enctype="multipart/form-data"
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action="@ACTION@">
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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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<input type=button value='Example 19' onClick="ex19()">
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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"?>\n\
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\n\
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<!-- Example from REC-rdf-syntax -->\n\
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\n\
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n\
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xmlns:s="http://description.org/schema/">\n\
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<rdf:Description about="http://www.w3.org/Home/Lassila">\n\
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<s:Creator>Ora Lassila</s:Creator>\n\
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</rdf:Description>\n\
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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"?>\n\
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\n\
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<!-- Example from REC-rdf-syntax, demonstrating reification -->\n\
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\n\
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<rdf:RDF\n\
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xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n\
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xmlns:s="http://description.org/schema/">\n\
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<rdf:Description about="http://www.w3.org/Home/Lassila" bagID="D_001">\n\
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<s:Creator>Ora Lassila</s:Creator>\n\
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<s:Title>Ora\'s Home Page</s:Title>\n\
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</rdf:Description>\n\
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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"?>\n\
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\n\
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<!-- Example from REC-rdf-syntax, non-binary relations -->\n\
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\n\
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<rdf:RDF\n\
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xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n\
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xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n\
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xmlns:n="http://www.nist.gov/units/">\n\
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<Description about="John_Smith">\n\
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<n:weight rdf:parseType="Resource">\n\
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<rdf:value>200</rdf:value>\n\
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<n:units rdf:resource="http://www.nist.gov/units/Pounds"/>\n\
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</n:weight>\n\
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</Description>\n\
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</rdf:RDF>';
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}
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function ex19()
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{ document.rdf.rdf.value='<?xml version="1.0"?>\n\
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\n\
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<!-- Example 19: Complete example of a RDF collection of nodes\n\
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using rdf:parseType="Collection" -->\n\
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\n\
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n\
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xmlns:ex="http://example.org/stuff/1.0/">\n\
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<rdf:Description rdf:about="http://example.org/basket">\n\
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<ex:hasFruit rdf:parseType="Collection">\n\
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<rdf:Description rdf:about="http://example.org/banana"/>\n\
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<rdf:Description rdf:about="http://example.org/apple"/>\n\
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<rdf:Description rdf:about="http://example.org/pear"/>\n\
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</ex:hasFruit>\n\
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</rdf:Description>\n\
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</rdf:RDF>';
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}
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</script>
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</body>
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</html>
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