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[2005-08-27 02:26 UTC] molily at gmx dot de
Description:
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It's not possible to use hasAttributeNS and getAttributeNS on attributes from the default namespace (i.e. without namespace prefix). They do not find the right attribute.
In addition to this, setAttributeNS cannot set an attribute in the default namespace. The new atttribute gets an incorrect namespace prefix.
I'm using the latest source snapshot php5-200508262230 (standard configuration but --without-pear) with libxml 2.6.20 (-r2 in Gentoo Portage).
Is this a libxml problem, like many DOM extension bugs before? Or do I misunderstand DOM 2 Core / XML Namespaces?
Reproduce code:
---------------
<?php
$dom = DOMDocument::loadXML('<a xmlns="http://namespaces.molily.de/x" xmlns:y="http://namespaces.molily.de/y" attra="attra" y:attrb="attrb" />');
$b = $dom->documentElement;
var_dump($b->hasAttributeNS('http://namespaces.molily.de/x', 'attra'));
var_dump($b->hasAttributeNS('http://namespaces.molily.de/y', 'attrb'));
var_dump($b->getAttributeNS('http://namespaces.molily.de/x', 'attra'));
var_dump($b->getAttributeNS('http://namespaces.molily.de/y', 'attrb'));
$b->setAttributeNS('http://namespaces.molily.de/x', 'attra', 'attra neu');
$b->setAttributeNS('http://namespaces.molily.de/y', 'attrb', 'attrb neu');
$b->setAttributeNS('http://namespaces.molily.de/x', 'attrc', 'attrc');
$b->setAttributeNS('http://namespaces.molily.de/y', 'attrd', 'attrd');
echo("\n");
var_dump($b->getAttributeNS('http://namespaces.molily.de/x', 'attra'));
var_dump($b->getAttributeNS('http://namespaces.molily.de/y', 'attrb'));
var_dump($b->getAttributeNS('http://namespaces.molily.de/x', 'attrc'));
var_dump($b->getAttributeNS('http://namespaces.molily.de/y', 'attrd'));
echo("\n");
var_dump($b->attributes->length);
echo($dom->saveXML());
?>
Expected result:
----------------
(As far as I know:)
bool(true)
bool(true)
string(5) "attra"
string(5) "attrb"
string(9) "attra neu"
string(9) "attrb neu"
string(5) "attrc"
string(5) "attrd"
int(4)
<?xml version="1.0"?>
<a xmlns="http://namespaces.molily.de/x" xmlns:y="http://namespaces.molily.de/y" attra="attra neu" y:attrb="attrb neu" attrc="attrc" y:attrd="attrd"/>
Actual result:
--------------
bool(false)
bool(true)
string(0) ""
string(5) "attrb"
string(0) ""
string(9) "attrb neu"
string(0) ""
string(5) "attrd"
int(5)
<?xml version="1.0"?>
<a xmlns="http://namespaces.molily.de/x" xmlns:y="http://namespaces.molily.de/y" attra="attra" y:attrb="attrb neu" y:attra="attra neu" y:attrc="attrc" y:attrd="attrd"/>
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Last updated: Fri Oct 24 14:00:01 2025 UTC |
Thanks, this explains why the first getAttributeNS call in the example doesn't work as I expected. The workaround is getAttributeNS(null, "attra") as per DOM 3 Core. The same goes for setAttributeNS if you want to set an attribute without namespace (it's possible to handle these attributes as if they use the default namespace, but there is this silly rule in XML Namespaces). But what's about the setAttributeNS problem? $b->setAttributeNS('http://namespaces.molily.de/x', 'attrc', 'attrc'); Why does this add an attribute with the namespace prefix ?y?? (see actual result: y:attrc="attrc" and expected result: attrc="attrc") ?y? is the prefix for the other namespace used in the example document. After running setAttributeNS, the attribute ?attrc? should be explicitly in the mentioned namespace ?http://namespaces.molily.de/x?. The rule ?default namespaces do not apply directly to attributes? doesn't apply. Why isn't it possible to getAttributeNS('http://namespaces.molily.de/x', 'attrc') after that? By the way, getAttributeNS('http://namespaces.molily.de/y', 'attrc') works, but why? I never told to use namespace ?y?, but it is used probably because it is the only namespace declared with prefix.