No grammar constraints (DTD or XML schema) detected for the document

I have this dtd : http://fast-code.sourceforge.net/template.dtd But when I include in an xml I get the warning : No grammar constraints (DTD or XML schema) detected for the document. The xml is : <?xml version=”1.0″ encoding=”UTF-8″?> <!DOCTYPE templates PUBLIC “//UNKNOWN/” “http://fast-code.sourceforge.net/template.dtd”> <templates> <template type=”INSTANCE_OF_CLASS”> <description>Used to Create instance of class</description> <variation>asasa</variation> <variation-field>asasa</variation-field> <class-pattern>asasa</class-pattern> <getter-setter>setter</getter-setter> <allowed-file-extensions>java</allowed-file-extensions> … Read more