Definition of document type definition in English:
A template that sets out the format and tag structure of an XML- or SGML-compliant document.
- A validating parser scans the XML file and determines if the document is well formed, as specified by either an XML schema or the document type definition.
- Specifically, it can validate XML data against a document type definition, an XML schema definition language schema, or an XML Data Reduced schema.
- Then, a document type definition can be written calling on any of the existing modules as needed.