The standard generalized markup language was support mostly by American publishers. The author of document preparer the text contain, they specific a uniform way the little, tables etc without the description of the actual representation (script type line specification). The publisher specifies the resulting layout, the SGML determines the form of tags, but is does not specify their location or meanings the SGML makes a frame available with which the user specifies syntax description in an object specific system. The SGML specifies the syntax but not the semantics.
The processing of SGML document divided into two processes that are formatter and parser. The parser only knows the meaning of the tag and it transforms the document
Document architecture SGML:
The processing of SGML document divided into two processes that are formatter and parser. The parser only knows the meaning of the tag and it transforms the document into a formatted document, where as the parser uses the tags, occurring into the document in combination with the corresponding document type specification of the document structure with the help of tag. Completed here parts of the layouts are linked together.SGML defines the syntax for tags through a grammar but doesn‟t define the semantics of these tags, The SGML document architecture emphasis in representation model. SGML with its tags posses representation model, object, classes and inheritance can be used for the definition of the structure, multimedia data are the supported in the SGML standard only in the form of graphics.
MHEG:
The ISO/ IEC/ 2ECL/SC29 committee are working on the standardization of the exchange format for multimedia systems, i.e. coding of pictures,audio, and hypermedia and multimedia information. The actual standards are developed at the international level in three working groups, co- operating with research and industry, the diagram shows that the three standard deal with the coding and compression of individual media. The result of the working groups, the jpeg, mpeg arc of special important in the area of multimedia system.
In multimedia presentation, the contents are described in the form of individual information objects with the help of WG1, WG11 and WH12. The structure (processing in time) is specified through spatial relation between the information objects. The standard of this structure description is the subject of WG12, which is known as the multimedia and hypermedia information coding export group (MHEG). The final MHEG standard will be described in three documents. The first part concept and exchange formats, the second parts describes an alternative semantically to the first part, is morph (alternative) syntax of the exchange format and the third part presents a reference architecture for a linkage to the script language.
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