<!ENTITY e1 "val">
<!ENTITY e2 "[&e1;]">
<!ELEMENT doc EMPTY>
<!ATTLIST doc
  att1 CDATA "/&e2;/&e1;/"
  att2 CDATA "
" att3 CDATA "	"
  att4 CDATA "&#xD;&#xA;&#x9;&#x20;"
  att5 CDATA #FIXED "&e1;">
