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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]
The first publicly available description of HTML was a document called "HTML Tags", first mentioned on the Internet by Berners-Lee in late 1991. [17] [18] It describes 18 elements comprising the initial, relatively simple design of HTML.
Sample form. The form is enclosed in an HTML table for visual layout.. Forms are enclosed in the HTML <form> element. This HTML element specifies the communication endpoint the data entered into the form should be submitted to, and the method of submitting the data, GET or POST.
DocBook is an XML language. In its current version (5.x), DocBook's language is formally defined by a RELAX NG schema with integrated Schematron rules. (There are also W3C XML Schema+Schematron and Document Type Definition (DTD) versions of the schema available, but these are considered non-standard.)
HTML is the most used and open international standard and it is also used as document file format. It has also become ISO / IEC standard (ISO 15445:2000). The default binary file format used by Microsoft Word ( .doc ) has become widespread de facto standard for office documents, but it is a proprietary format and is not always fully supported ...
It supports a handful of HTML-like tags (<small> <center> <plain>) and a special notation with English keywords or key-value pairs $[key=value content] for spans with stylistic effects applied, e.g. fonts, blurs, borders and transformations such as flipping, shifting, rotating, scaling and animation, but also for furigana and search boxes. [56]
RDFa was defined in 2008 with the "RDFa in XHTML: Syntax and Processing" Recommendation. [16] Its first application was to be a module of XHTML.. The HTML applications remained, "a collection of attributes and processing rules for extending XHTML to support RDF" expanded to HTML5, are now expressed in a specialized standard, the "HTML+RDFa" (the last is "HTML+RDFa 1.1 - Support for RDFa in ...
An SGML document in which, for each document instance, there is an associated document type declaration (DTD) to whose DTD that instance conforms. A tag-valid SGML document is defined by the standard as An SGML document, all of whose document instances are fully tagged. There need not be a document type declaration associated with any of the ...