libxml2
1: <!DOCTYPE foo [ 2: <!ELEMENT foo (root*)> 3: <!ELEMENT root EMPTY> 4: <!ENTITY utf16b SYSTEM "dtds/utf16b.ent"> 5: <!ENTITY utf16l SYSTEM "dtds/utf16l.ent"> 6: ]> 7: 8: <foo> &utf16b; &utf16l; </foo>