test/valid/UTF16Entity.xml - third_party/libxml2 - Git at Google

 <!DOCTYPE foo [
 <!ELEMENT foo (root*)>
 <!ELEMENT root EMPTY>
 <!ENTITY utf16b SYSTEM "dtds/utf16b.ent">
 <!ENTITY utf16l SYSTEM "dtds/utf16l.ent">
 ]>

 <foo> &utf16b; &utf16l; </foo>
	<!DOCTYPE foo [
	<!ELEMENT foo (root*)>
	<!ELEMENT root EMPTY>
	<!ENTITY utf16b SYSTEM "dtds/utf16b.ent">
	<!ENTITY utf16l SYSTEM "dtds/utf16l.ent">
	]>

	<foo> &utf16b; &utf16l; </foo>