Error parsing XML document

http://www.menota.org/guidelines-2/schemes/menota-entities.txt:2: parser error : internal error
<!DOCTYPE html
^
http://www.menota.org/guidelines-2/schemes/menota-entities.txt:2: parser error : DOCTYPE improperly terminated
<!DOCTYPE html
^
http://www.menota.org/guidelines-2/schemes/menota-entities.txt:2: parser error : Start tag expected, '<' not found
<!DOCTYPE html
 ^
 at /usr/lib/perl5/site_perl/Aksis/XSLTransformer/Application.pm line 154