Edit report at http://bugs.php.net/bug.php?id=49490&edit=1
ID: 49490
Comment by: thomas at weinert dot info
Reported by: olav dot morken at uninett dot no
Summary: XPath namespace prefix conflict
Status: Open
Type: Bug
Package: DOM XML related
Operating System: Linux (Debian)
PHP Version: 5.3.0
New Comment:
It looks like DOMXPath->evaluate()/DOMXPath->query() registers the
namespace prefixes of the given context and overrides any definition
from DOMXPath->registerNamespace(). PHP should not register any
namespaces from the context or at least prefer manual registrations over
automatic.
Reproduce code:
---------------
$dom = new DOMDocument();
$dom->loadXML(
'<foobar><a:foo xmlns:a="urn:a">'.
'<b:bar xmlns:b="urn:b"/></a:foo>'.
'</foobar>'
);
$xpath = new DOMXPath($dom);
//get context node and check "a:foo"
$context = $dom->documentElement->firstChild;
var_dump($context->tagName);
// try to override the context node
$xpath->registerNamespace('a', 'urn:b');
var_dump(
$xpath->evaluate(
'descendant-or-self::a:*',
$context
)->item(0)->tagName
);
// use a prefix not used in context
$xpath->registerNamespace('prefix', 'urn:b');
var_dump(
$xpath->evaluate(
'descendant-or-self::prefix:*',
$context
)->item(0)->tagName
);
Expected result:
----------------
string(5) "a:foo"
string(5) "b:bar"
string(5) "b:bar"
Actual result:
----------------
string(5) "a:foo"
string(5) "a:foo"
string(5) "b:bar"
Previous Comments:
------------------------------------------------------------------------
[2009-09-07 08:41:26] olav dot morken at uninett dot no
Description:
------------
When processing an XML document with namespaces, an XPath query for a
node with a different namespace but the same namespace prefix fails.
This appears to be a conflict between the XPath namespaces and the
document namespaces. It works if either:
- The prefix in the query is replaced with a prefix that doesn't
exist in the document.
- If the prefix in the query matches the prefix in the document.
This was tested with:
- PHP 5.3 from debian experimental: 5.3.0-3
- libxml2 2.7.3.dfsg-2.1
Reproduce code:
---------------
$doc = new DOMDocument();
$doc->loadXML('<prefix:root xmlns:prefix="urn:a" />');
$xp = new DOMXPath($doc);
$xp->registerNamespace('prefix', 'urn:b');
echo($xp->query('//prefix:root')->length . "\n");
Expected result:
----------------
It should not find the root node, since we ask for a node in a different
prefix. I.e. it should print '0'.
Actual result:
--------------
It finds the root node, i.e. it prints '1'.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=49490&edit=1
