1 <!DOCTYPE doc [ 2 <!ELEMENT doc (tst*)> 3 <!ELEMENT tst (#PCDATA)> 4 <!ATTLIST tst a NMTOKENS #IMPLIED> 5 <!ATTLIST tst b CDATA #IMPLIED> 6 <!ENTITY d "
"> 7 <!ENTITY a "
"> 8 <!ENTITY da "
"> 9 ]> 10 <doc> 11 <tst a=" 12 13 xyz" b=" 14 15 xyz"/> 16 <tst a="&d;&d;A&a; &a;B&da;" b="&d;&d;A&a; &a;B&da;"/> 17 <tst a="

A

B
" b="

A

B
"/> 18 <tst a=" x  y " b=" x  y "/> 19 <tst a=" a b " b=" a b "/> 20 <tst a=" a b " b=" a b "/> 21 </doc> 22 23