1--TEST--
2Serialize non-default but empty xmlns
3--EXTENSIONS--
4dom
5--FILE--
6<?php
7
8$dom = DOM\XMLDocument::createFromString('<test xmlns="urn:a"><a:child xmlns:a=" "/></test>');
9
10echo $dom->saveXML(), "\n";
11
12?>
13--EXPECTF--
14Warning: DOM\XMLDocument::createFromString(): xmlns:a: ' ' is not a valid URI in Entity, line: 1 in %s on line %d
15<?xml version="1.0" encoding="UTF-8"?>
16<test xmlns="urn:a"><a:child xmlns:a=" "/></test>
17