test/defattr2.xml - third_party/github.com/GNOME/libxml2 - Git at Google

 <!DOCTYPE doc [
 <!ELEMENT doc EMPTY>
 <!ATTLIST doc
      defatt  (0|1)   "0"
      xmlns:tst CDATA #FIXED "http://example.org"
      tst:att (0|1)   "1">
 ]>
 <doc att="1"/>
	<!DOCTYPE doc [
	<!ELEMENT doc EMPTY>
	<!ATTLIST doc
	defatt (0\|1) "0"
	xmlns:tst CDATA #FIXED "http://example.org"
	tst:att (0\|1) "1">
	]>
	<doc att="1"/>