#data
<!DOCTYPE x [
  <!ENTITY foo "a<a">
]><x b="&foo;"/>
#errors
1;1;no XML decl;;;s
3;9;entref in attr has element;;&foo;;m
#document
| <!DOCTYPE x>
| <{} x>
|   b="&foo;"

#data
<!DOCTYPE x [
  <!ENTITY foo "a<a">
  <!ATTLIST foo bar CDATA "&foo;">
]><x/>
#errors
1;1;no XML decl;;;s
3;28;entref in attr has element;;&foo;;m
#document
| <!DOCTYPE x>
|   <!ELEMENT foo >
|     bar CDATA () EXPLICIT "&foo;"
| <{} x>