Markup language validating system


A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML).A Document Type Definition (DTD) defines the legal building blocks of an XML document.It defines the document structure with a list of legal elements and attributes.A DTD can be declared inline inside an XML document, or as an external reference., newer XML namespace-aware schema languages (such as W3C XML Schema and ISO RELAX NG) have largely superseded DTDs.A namespace-aware version of DTDs is being developed as Part 9 of ISO DSDL.DTDs persist in applications that need special publishing characters, such as the XML and HTML Character Entity References, which derive from larger sets defined as part of the ISO SGML standard effort.The declarations in the internal subset form part of the DOCTYPE in the document itself.

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Non-validating parsers may eventually attempt to locate these external entities in the non-standalone mode (by partially interpreting the DTD only to resolve their declared parsable entities), but do not validate the content model of these documents.

The following example of a DOCTYPE contains both public and system identifiers: The system identifiers of these DTDs, if present in the DOCTYPE, are URI references.



Markup language validating system comments


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