Some technical stuff
<html> : first Tag. One indicates it is HTML. <head>2nd Tag: indicate the form, page title
<meta name>Meta information: existing information invisible on your browser. Webmaster can put here everything he wants wants. Search engines like Alta Vista will read these meta information in order to index billions of pages.
etc...
Finally, it is very simple, very convenient. Moreover with the increasing evolution of Internet Language XML, closer from SGML since it uses DTD, XML should be gradually implemented.
Definition: DTD. Document type Definition. Structure Model of a kind of document, written in SGML Language .
It is there that all the power of this Language resides. Indeed all the form, the formatting, the organization of information is structured in such a called specific data base : Repository.
SGML What for ?
SGML is thus much more complex than HTML. But what for?
Imagine that you wish to digitalize, then to index on a system of GED/WORKFLOW / Intranet with search engine data base like the Washington Congress library which own billions documents in different forms.
It is clear that for a as strategic and expensive project it is necessary information Systems complies with the following guarantees:
- Timelessness of information : the use of the tags and other identifiers makes information immediately accessible and reusable.
- independent: Preserving Investment by putting its strategic documents in SGML, companies are protected from hegemony of a single editor, manufacturer or OS.
- availability: on a SGML document , the form and the substance of a document are completely separate. That implies a great flexibility for the update, the diffusion
- Interoperability of the applications: Language SGML would be the lingua franca applications on open Systems that means that the user can choose the tool which is appropriate for him ignored to create, manage and retrieve its data and documents.
