./test/valid/t8.xml:6: parser error : internal error: xmlParseInternalSubset: error detected in Markup declaration

%defroot; %defmiddle; %deftest;
         ^
Entity: line 1: 
<!ELEMENT root (middle) >
^
./test/valid/t8.xml:6: parser error : internal error: xmlParseInternalSubset: error detected in Markup declaration

%defroot; %defmiddle; %deftest;
                     ^
Entity: line 1: 
<!ELEMENT middle (test) >
^
./test/valid/t8.xml:6: parser error : internal error: xmlParseInternalSubset: error detected in Markup declaration

%defroot; %defmiddle; %deftest;
                               ^
Entity: line 1: 
<!ELEMENT test (#PCDATA) >
^