Tests RDF namespaces.
function testGetRdfNamespaces() {
// Fetches the front page and extracts RDFa 1.1 prefixes.
$this
->drupalGet('');
$element = $this
->xpath('//html[contains(@prefix, :prefix_binding)]', array(
':prefix_binding' => 'rdfs: http://www.w3.org/2000/01/rdf-schema#',
));
$this
->assertTrue(!empty($element), 'A prefix declared once is displayed.');
$element = $this
->xpath('//html[contains(@prefix, :prefix_binding)]', array(
':prefix_binding' => 'foaf: http://xmlns.com/foaf/0.1/',
));
$this
->assertTrue(!empty($element), 'The same prefix declared in several implementations of hook_rdf_namespaces() is valid as long as all the namespaces are the same.');
$element = $this
->xpath('//html[contains(@prefix, :prefix_binding)]', array(
':prefix_binding' => 'foaf1: http://xmlns.com/foaf/0.1/',
));
$this
->assertTrue(!empty($element), 'Two prefixes can be assigned the same namespace.');
$element = $this
->xpath('//html[contains(@prefix, :prefix_binding)]', array(
':prefix_binding' => 'dc: http://purl.org/dc/terms/',
));
$this
->assertTrue(!empty($element), 'When a prefix has conflicting namespaces, the first declared one is used.');
}