1<?xml version="1.0" standalone="yes"?> 2<!DOCTYPE attributes [ 3<!ELEMENT attributes EMPTY> 4<!ATTLIST attributes nmtoken NMTOKEN #IMPLIED> 5<!ATTLIST attributes nmtokens NMTOKENS #IMPLIED> 6<!ENTITY ent " entity&recursive; "> 7<!ENTITY recursive "reference"> 8]> 9<attributes nmtoken="&ent; &ent; &ent;" nmtokens="Test this normalization"/> 10