The History Of Markup Languages Information Technology Essay

The History Of Markup Languages In work outation Technology Essay put down markup is a process of writing codes in a record to see structure and format of a final expression of a inventory. Markup was through by copy editor writing instruction on scroll that was followed by type destinyter, onwards the computerization of patsying industry. After computerization, school text change linguistic communications were written. Copy editors markup was converted into the normal markup by a typesetter. When computers spread over the b both, people began utilise word processing parcel to write registers. for distri notwithstandingively one word processing chopine had its own feature and technique of markup. both electronic documents which store text use some form of markup. These markups potty be visible, hidden or self-generated.Document markup divided into two categories circumstantial markup and generic markup. Specific markup uses instructions which ar specific to the certain softwargon system that produces document. Generic markup indentifies structure of a document. The beginning of generic markup was macros for typesetting wording. Series of commands apprise be executed by software instruction which called macro. Furthermore, macro keeps slash of chapter numbers in document and the change of macro stop characterise the feature of the chosen chapter.The first getation about markup phrases was made by William Tunnicliffe at Canadian Government Printing Office in 1967. posterior in 1969 Raymond Lorie, Edward Mosher, and Charles Goldfarb gaind generalised Markup Language (GML). GML was based on ideas of Tunnicliffe. In 1978 GML committal decide to make changes in markup and make it generic. They limited informationbase searches to title by stain title as instead of and . It was a beginning of archetype generalized markup language which was based on both GML and Gencode. SGML was developed during the years and outright it is use by major government agencies.HyperText Markup Language (hypertext markup language) is a markup language that creates web pages. Nowadays, all web pages are made by using HTML or another language which uses basic elements of HTML. Since 1990 when Tim Berners-Lee invented HTML, this markup language started to push and now it is the most primary language in a world of web. HTML developed from HTML 1.0 to HTML 4.0 in 7 years.In 1994, first HTML 2.0 document was released premiere draft HTML 3.0 was released in 1995In 1996, HTML 3.0 was developed to HTML 3.2HTML 4.0 was released later in 1997. HTML 4.0 is the current version of HTML.-XMLXML was created in 1996 by XML Working convention which was lead by Jon Bosak. The design goal of XML wasXML should be good tender over the internetVarious applications essential be supported by XMLXML should be similar to SGML. SGML is another markup language which was created before SGML. more precise information about SGML will be granted in the next sectionXML should be designed brief and official.It should be easy for beginners to create documents in XMLXML, Extensible Markup Language, is a standard for document markup which is supported by World Wide electronic network Consortium (W3C). XML is markup language and a restricted form of Standardized General Markup Language (SGML) which provides a standard format for electronic documents. This format lav be easily customized for web sites, vector graphics, object serialization and voice-mail systems. Programs which control data in XML documents can be written by exploiters. So, the availability of libraries in un like languages that can write and read XML, allows users to concentrate on the unique of necessity of their program. moreover, XML documents can be modified using text editors and web browsers. data of XML is included as strings of text in this type of documents. XML and HTML documents look similar. However thither are some important differences. First of all , XML is a matemarkup language. That means XML provides sets of elements and tags that can work for everybody in different areas of interest. For example, Chemists can use molecules, atoms and reactions by using appropriate elements. Musicians can use elements notes, lyrics and a great deal more that concerns their job. XML is a language that can be adapted to get different requirements. Basic unit of data of XML is called an element. XML reveal how elements surrounded by tags, the specification of tags and the names which appropriate for elements. The documents which satisfy these requirements are successfully organise Otherwise documents containing errors will be rejected by XML.Documents in XML are compared with specific scheme. If a document matches scheme therefore this document considered valid. disable documents are not equivalent to scheme, notwithstanding it is not important for all documents to be valid. there are diverse XML schemes. Document type translation ( DTD) is the mostly supported scheme which is the moreover scheme that supported by XML 1.0. DTD contains the entire legal markup and identifies places where these markups can be inserted in the document.-SGMLWorldwide standard for the explanation of device-independent, system-independent ways if representing texts in electronic form called Standard Generalized Markup Language (SGML). SGML documents are not limited by sizing and can form an independent unit that transported either electronically or in printed form. SGML documents contain interconnected elements that hold data armed service for specific purpose. Document Type Definition (DTD) characterizes documents structure according to the elements it contains and the identify of these elements. DTD is linked with a SGML. Within the DTD each element in the document named in fellowship to recognize the role of this element. The recognized elements can form the tags that identify the start and the end of elements, when they p laced within markup delimiters. SGML parses must authorize files that positioned into the repository.SGML system can be constructed from interrelated software components. Data repository is a central part of SGML system. onward the documents are dispatched from the repository another validation needed in order to guarantee that referenced data has not been neglected from the transmitted data set.SGML documents can be formatted according to features required by the author. at that place is a standard for definingthe structure of documents classescharacters for markup, and in the text of documentcommon text that will be writtenspecial marking up techniques like tag minimization or identification of various versions of documentAttributes qualify some SGML markup tags. These attributes can help to identify specific tags, recall data that is externally stored and indicate the role of elements. Moreover attributes can control the way of presenting text to readers. SGML not only make eas y to associate feature to text by improvident form of tags, but in like manner named character references can be used to demand characters that are not included in character set of word processor.In order to modify SGML-coded document, it needed to be converted into form that word processors can understand. It is a complex process for generalized SGML document and there one application which is specifically designed for converting word -processed text into and out of SGML. This application is called HyperText Markup Language (HTML) that is used on the World Wide Web.-HTML and XHTMLHyperText Markup Language (HTML) is the computer program that allows user to create own web page by formatting text and present it to the Internet public. First of all, hypertext and customaryity are the main qualities of HTML. Hypertext means that it come-at-able to insert a link in a webpage that leads to another webpage. So, it is contingent to access information on the internet from various places . Secondly, HTML is universal language, because these types of documents can be accessed from any computer such as mac, UNIX and Microsoft. excess programs were designed in order to read HTML pages. These programs called browsers and the popular ones are Mozilla Firefox, Internet Explorer, Netscape operator and Opera.XML looks like HTML language However , XML is a language that not only helps to create web pages, but also the program by which author can create his custom markup language to format documents. By using XML It is possible to use written data as custom information and used it further in the text. Nevertheless, XML is not as merciful as HTML. XML need careful coding, since XML is sensitive to stop number and lowercase letters, quotations and tags. There is a huge number of HTML pages that can be read by any browser. So, World Wide Web Consortium (W3C) decided to write HTML in XML. This stark naked machination that called XHTML had all features of HTML as well as XML s power and flexibility.-TEXThere are two different categories of text processorsWYSIWYG (what you see is what you get) system. user can see exactly what his document will look like while typing text.Markup system, Authors type text scattered with formatting commands, but they are unable to see appearance of their document while working(a) on text. In order to see final result user must run the program.Since the final product can be seen by author, WYSIWYG systems have the obvious advantage however, person can easily be distracted by the appearance of the document and will be unable to write the root effectively. Because of these reasons, people who want academic paper prefer markup systems. TEX is an example of the markup system that was built in early eighteens, before WYSIWYG systems were widespread.Advantages of TEXTEX documents formed by the help of macros, that define format of each component. By the help of macros users dont have to write unnecessary formatting commands. F or example, in order to write a comment it is enough to write footnote command, instead of moving text to the bottom of page. Macros make TEX flexible. By changing definition of certain macro, the appearance of a document can be changed. TEX is easily adaptable, since new commands can be created. In order to print document which is written in TEX, user needs to give the rig to a number one wood program which will convert descriptions into commands that understood by printers. Tex is doesnt rely on technology of printers you just write a new driver when technology changes. TEX is freely available over the internet. TEX is an ideal program to create academic papers and even books.Disadvantages of TEXFirst of all, beginners have bother at getting used to TEX programming. It is easy to write primary macros, but writing complex macros is not a beginners work. Moreover, memory and design of TEX is limited, it doesnt provoke dynamically and it uses only its own fonts. The most spread problem is interactivity of TEX. However, there is a solution to this problem. Many programs that give additional features to TEX are available. For example, Macintosh users can access the program named TEXtures that helps user toEdit multiple texts at the same time with a multi-window editorView the output of the program on the screen by the help of previewerA printer driverTEX proper.PC clone users can only edit one text at a time. User, should first of all edit a file, wherefore run this document by the help of TEX, afterwards use previewer in order to see the output on the screen. If there are mistakes in the text user must write all of them down then edit file again.Nowadays, most common used systems are WYSIWYG programs that use a TEX engine. User can easily change appearance by few mouse clicks without having any knowledge about TEX.