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