test/issue643.xml - third_party/github.com/GNOME/libxml2 - Git at Google

 <?xml version="1.0"?>
 <!DOCTYPE doc [
     <!ATTLIST elem xmlns CDATA #FIXED 'urn:def2'>
     <!ATTLIST elem xmlns:a CDATA #FIXED 'urn:a2'>
 ]>

 <doc xmlns="urn:def" xmlns:a="urn:a">
     <elem/>
 </doc>
	<?xml version="1.0"?>
	<!DOCTYPE doc [
	<!ATTLIST elem xmlns CDATA #FIXED 'urn:def2'>
	<!ATTLIST elem xmlns:a CDATA #FIXED 'urn:a2'>
	]>

	<doc xmlns="urn:def" xmlns:a="urn:a">
	<elem/>
	</doc>