Tag Omission
Tag omission is an optional feature to minimize an SGML document. Whenever a tag can be implicitly anticipated by the parser from the structure of the document, the tag can be omitted. The tag omission feature can be generally enabled or disabled in the SGML Declaration. The Document Type Definition is used to enable or disable the tag for a specific tag. Tag omission is one of the main features of SGML which was removed from XML Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable ... to simplify parsing. Example In this example the <document> tag has a distinct order of the tags. The information that <title> needs to come first and is followed by <p> can be used to omit the title start and end tag. Furthermore, the end tag of <p> can also be omitted, because ...
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Standard Generalized Markup Language
The Standard Generalized Markup Language (SGML; ISO 8879:1986) is a standard for defining generalized markup languages for documents. ISO 8879 Annex A.1 states that generalized markup is "based on two postulates": * Declarative: Markup should describe a document's structure and other attributes rather than specify the processing that needs to be performed, because it is less likely to conflict with future developments. * Rigorous: In order to allow markup to take advantage of the techniques available for processing, markup should rigorously define objects like programs and databases. DocBook SGML and LinuxDoc are examples which used SGML tools. Standard versions SGML is an ISO standard: "ISO 8879:1986 Information processing – Text and office systems – Standard Generalized Markup Language (SGML)", of which there are three versions: * Original ''SGML'', which was accepted in October 1986, followed by a minor Technical Corrigendum. * ''SGML (ENR)'', in 1996, r ...
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Document Type Definition
A document type definition (DTD) is a set of ''markup declarations'' that define a ''document type'' for an SGML-family markup language ( GML, SGML, XML, HTML). A DTD defines the valid building blocks of an XML document. It defines the document structure with a list of validated elements and attributes. A DTD can be declared inline inside an XML document, or as an external reference. XML uses a subset of SGML DTD. , 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. Associating DTDs with documents A DTD is associated with an XML or SGML document by means of a document type declaration (DOCTYPE). The DOCTYPE appears in the syntactic fr ...
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Markup Language Comparisons
Markup or mark-up can refer to: * Markup language, a standardized set of notations used to annotate a plain-text document's content to give information regarding the structure of the text or instructions for how it is to be displayed ** Lightweight markup language, notation that adds basic markup to a client * Markup rule in economics, a formula for the ratio of a monopolist's chosen price to its marginal cost * Markup (business) a term in retail business describing the increase in the price of goods to cover expenses and create a profit margin * Markup (legislation), the process to amend bills * The Markup ''The Markup'' is an American nonprofit news publication focused on the impact of technology on society. Founded in 2018 with the goal of advancing data-driven journalism, the publication is headquartered in New York City. History ''The Marku ...