<?xml version='1.0' standalone='yes'?>
<!DOCTYPE attributes [
<!ELEMENT attributes EMPTY>
<!ATTLIST attributes
   nmtoken    NMTOKEN    #IMPLIED
   nmtokens   NMTOKENS   #IMPLIED>
<!ENTITY ent " entity&recursive; ">
<!ENTITY recursive "reference">
]>
<attributes
  nmtoken =  " &ent;   &ent; &ent; "
  nmtokens = " Test&#x0d;&#x0a;     this&#x20; normalization "
/>