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Editorial Team
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Asked: 2026-05-14T00:39:27+00:00

I am using php’s simple xml and xpath to parse an rdf xml file

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I am using php’s simple xml and xpath to parse an rdf xml file and am struggling to get a list of all the rdf:about values.

Any advice?

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1 Answer

  1. Editorial Team

    There seems to be an issue when using SimpleXml with namespaced attributes prior to PHP5.3. Basically, anything with a : will be dropped when converted to an object property of a SimpleXml element. The following will do, but feels hackish to me:

    $rdf = str_replace('rdf:about', 'rdf_about', $rdf);  
$rdf = new SimpleXMLElement($rdf);
foreach($rdf->xpath('//@rdf_about') as $node) {
  echo $node, PHP_EOL;
}

    See here:

    You could use DOM instead of SimpleXml:

    $dom = new DomDocument;
$dom->loadXml($rdf);
$xph = new DOMXPath($dom);
$xph->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
foreach($xph->query('//@rdf:about') as $attribute) {
    echo $attribute->value, PHP_EOL;
}

    But, I suggest using a dedicated library for this over SimpleXml or DOM:

    And here’s a blog post about the parsers:

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