public function testExpandWithoutDefault()
 {
     EasyRdf_Namespace::setDefault(null);
     $this->assertSame('unknown', EasyRdf_Namespace::expand('unknown'));
 }
<?php

/**
 * Example of reading Open Graph Protocol properties
 *
 * @package    EasyRdf
 * @copyright  Copyright (c) 2012-2013 Nicholas J Humfrey
 * @license    http://unlicense.org/
 */
set_include_path(get_include_path() . PATH_SEPARATOR . '../lib/');
require_once "EasyRdf.php";
EasyRdf_Namespace::setDefault('dc11');
?>
<html>
<head>
  <title>Open Graph Protocol example</title>
</head>
<body>

<?php 
$doc = EasyRdf_Graph::newAndLoad('http://www.rottentomatoes.com/m/10011268-oceans/');
?>

<p>
  Title: <?php 
echo $doc->title;
?>
<br />
  Creator: <?php 
echo $doc->creator;
?>
 public function testMagicUnset()
 {
     $this->setupTestGraph();
     EasyRdf_Namespace::setDefault('rdf');
     $this->resource->add('rdf:testMagicUnset', 'testMagicUnset');
     unset($this->resource->testMagicUnset);
     $this->assertStringEquals(null, $this->resource->get('rdf:testMagicUnset'));
 }
 public function testMagicUnset()
 {
     EasyRdf_Namespace::setDefault('rdf');
     $this->graph->add($this->graph->getUri(), 'rdf:test', 'testMagicUnset');
     unset($this->graph->test);
     $this->assertStringEquals(null, $this->graph->get($this->graph->getUri(), 'rdf:test'));
 }