Bug #81468 [Opn->Ver]: Inconsistent default namespace inheritance

Edit report at https://bugs.php.net/bug.php?id=81468&edit=1 ID: 81468 Updated by: cmb@php.net Reported by: dennis dot verspuij+php at gmail dot com Summary: Inconsistent default namespace inheritance -Status: Open +Status: Verified Type: Bug Package: DOM XML related PHP Version: 8.0.10 Block user comment: N Private report: N Previous Comments: ------------------------------------------------------------------------ [2021-09-23 11:21:41] cmb@php.net This inconsistency[1] is a bug, and I think it's an issue with our use of libxml2, although I'm not absolutely sure. We may miss to call some libxml2 API here, or maybe we need to "fix" the missing namespace in dom_reconcile_ns()[2] manually. Also note, that I think the different behavior is not related to saving the document, but rather that reloading the document fixes the DOM. [1] <https://3v4l.org/iLfmV> [2] <https://github.com/php/php-src/blob/php-7.4.24/ext/dom/node.c#L160> ------------------------------------------------------------------------ [2021-09-23 09:03:56] dennis dot verspuij+php at gmail dot com Description: ------------ A child node created with DOMDocument::createElement() added to an element with a non-empty default namespace internally does not seem to inherit the default namespace of the parent, while when saving the XML it looks like it does. And imho it should inherit the namespace, because a node created with createElement() does not yet have a namespace until it is added somewhere in the document (hence parameter name localName). In contrary a node created with createElementNS() keeps its explicit namespace once added anywhere. Not sure if this a libxml bug, or a bug in PHP xml extension. Test script: --------------- <?php $dom = new \DOMDocument(); $dom ->appendChild($dom->createElementNS('some:namespace', 'foo')) ->appendChild($dom->createElement('bar')); echo ($xml = $dom->saveXML()); $xpath = new \DOMXPath($dom); $xpath->registerNamespace('n', 'some:namespace'); echo count($xpath->query('/n:foo/bar')) . " should be 0\n"; echo count($xpath->query('/n:foo/n:bar')) . " should be 1\n\n"; // $dom = new \DOMDocument(); $dom->loadXml($xml); echo ($xml = $dom->saveXML()); $xpath = new \DOMXPath($dom); $xpath->registerNamespace('n', 'some:namespace'); echo count($xpath->query('/n:foo/bar')) . " should be 0\n"; echo count($xpath->query('/n:foo/n:bar')) . " should be 1\n\n"; Expected result: ---------------- See test script and output. Actual result: -------------- See test script and output. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81468&edit=1