Description:
------------
When a node has inner nodes and you want to search into its text value, only the first text node is selected.

This is wrong because, as http://www.w3.org/TR/xpath/#path-abbrev says:
> text() selects all text node children of the context node

Test script:
---------------
$xml = <<<END
<?xml version="1.0" encoding="UTF-8"?>
<root>
    <first>
        Hello
        <second>
            world
        </second>
        world
    </first>
</root>
END;

$doc = DOMDocument::loadXML($xml);
$xpath = new DOMXPath($doc);

foreach ($xpath->query('//*[contains(text(), "world")]') as $node)
    echo $node->nodeName . PHP_EOL;

Expected result:
----------------
first
second

Actual result:
--------------
second