test/VC/ElementValid8 - third_party/libxml2 - Git at Google

 <!DOCTYPE doc [
 <!ELEMENT doc ((a, b)| (a, c))>
 <!ELEMENT a EMPTY>
 <!ELEMENT b (#PCDATA)>
 <!ELEMENT c (#PCDATA)>
 ]>
 <doc><a/><c> doc is non-deterministic </c></doc>
	<!DOCTYPE doc [
	<!ELEMENT doc ((a, b)\| (a, c))>
	<!ELEMENT a EMPTY>
	<!ELEMENT b (#PCDATA)>
	<!ELEMENT c (#PCDATA)>
	]>
	<doc><a/><c> doc is non-deterministic </c></doc>