Spurious bnodes in Turtle output
From: Alex Cozzi
Subject: Spurious bnodes in Turtle output
Date: Wed, 22 Apr 2009 15:27:22 -0700
I am using ARC2 to parse and generate Turtle output and I observe that
it generates spurious bnode. Here is the minimal example that i can
get to show the problem:
Given this php code:
<html>
<head>
<style>
div.turtle {
border: 1px;
font-family: consolas, courier, sans-serif;
font-size: 8pt;
white-space: pre;
background-color: #e5e5e5;
}
</style>
<title>ARC Turtle test</title>
</head>
<body>
<?php
include_once("./arc/ARC2.php");
$parser = ARC2::getSemHTMLParser();
$parser->parse("test.xml");
$parser->extractRDF('rdfa');
$triples = $parser->getTriples();
$serializer = ARC2::getTurtleSerializer();
echo "<h2 align=\"center\">RDF content (Turtle)</h2>";
echo "<div class=\"turtle\">" . htmlspecialchars($serializer-
>toTurtle($triples)
) . "</div>\n";
?>
</body>
</html>
and this test.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns:dc="http://purl.org/dc/terms/" xmlns:foaf="http://xmlns.com/foaf/0.1/
">
<body>
<p rel="dc:subject">
<span typeof="foaf:name"/>
</p>
</body>
</html>
I get the following Turtle output:
RDF content (Turtle)
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ns0: <http://xmlns.com/foaf/0.1/> .
@prefix ns1: <http://purl.org/dc/terms/> .
_:arcf418b2 rdf:type ns0:name .
<file:///Users/xela/Sites/test.xml> ns1:subject _:arcf418b2 ,
_:arcf418b1 .
As you can notice 2 blank nodes where generated, where instead I was
expecting only 1.
for comparison pyRDFa distiller generates:
<test.xml> dc:subject
[ a foaf:name
] .
