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[citation needed] Most of the publishing world has found that the added complexity of XSD would not bring them any particular benefits, [citation needed] so DTDs are still far more popular there. An XML Schema Definition is itself an XML document while a DTD is not. RELAX NG, which is also a part of DSDL, is an ISO international standard. [9]
A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a web page) with a document type definition (DTD) (for example, the formal definition of a particular version of HTML 2.0 - 4.0). [1]
DTDs are perhaps the most widely supported schema language for XML. Because DTDs are one of the earliest schema languages for XML, defined before XML even had namespace support, they are widely supported. Internal DTDs are often supported in XML processors; external DTDs are less often supported, but only slightly.
DTDs have the following benefits: DTD support is ubiquitous due to its inclusion in the XML 1.0 standard. DTDs are terse compared to element-based schema languages and consequently present more information in a single screen. DTDs allow the declaration of standard public entity sets for publishing characters.
The most obvious features offered in XSD that are not available in XML's native Document Type Definitions (DTDs) are namespace awareness and datatypes, that is, the ability to define element and attribute content as containing values such as integers and dates rather than arbitrary text.
ODD: A 'One Document Does-it-all' TEI format for simultaneously recording project documentation and meta-schema definition from which you can generate RELAX NG, W3C XML Schema, and DTDs as well as formatted documentation. ODRL: an XML-based standard Rights Expression Language (REL) used in digital rights management systems
A valid XML document is defined in the XML specification as a well-formed XML document which also conforms to the rules of a Document Type Definition (DTD). According to JavaCommerce.com XML tutorial, "Well formed XML documents simply markup pages with descriptive tags. You don't need to describe or explain what these tags mean.
A Formal Public Identifier (FPI) is a short piece of text with a particular structure that may be used to uniquely identify a product, specification or document.FPIs were introduced as part of Standard Generalized Markup Language (SGML), and serve particular purposes in formats historically derived from SGML (HTML and XML).