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Friday, July 26, 2013

PPT On Document Architecture

Presentation On Document Architecture

Document Architecture Presentation Transcript: 
1.Document Architecture

Exchanging documents entails exchanging the document content as well as the document structure. This requires that both documents have the same document architecture. The current standards in the document architecture are
1. Standard Generalized Markup Language

2. Open Document Architecture

The Standard Generalized Markup Language (SGML) was supported mostly by American publisher. Authors prepare the text, i.e., the content. They specify in a uniform way the title, tables, etc., without a description of the actual representation (e., script type and line distance). The publisher specifies the resulting layout.
The basic idea is that the author uses tags for marking certain text parts. SGML determines the form of tags. But it does not specify their location or meaning. User groups agree on the meaning of the tags.

4.SGML makes a frame available with which the user specifies the syntax description in an object-specific system. Here, classes and objects, hierarchies of classes and objects, inheritance and the link to methods (processing instructions) can be used by the specification. SGML specifies the syntax, but not the semantics.

5.For example,
Felix Gatou
This exceptional paper from Peter…
This example shows an application of SGML in a text document.

The Open Document Architecture (ODA) was initially called the Office Document Architecture because it supports mostly office-oriented applications. The main goal of this document architecture is to support the exchange, processing and presentation of documents in open systems. ODA has been endorsed mainly by the computer industry, especially in Europe.

7.Details Of ODA
The main property of ODA is the distinction among content, logical structure and layout structure. This is in contrast to SGML where only a logical structure and the contents are defined. ODA also defines semantics. Following figure shows these three aspects linked to a document. One can imagine these aspects as three orthogonal views of the same document. Each of these views represent on aspect, together we get the actual document.

8.Details Of ODA
The content of the document consists of Content Portions. These can be manipulated according to the corresponding medium.

9.A content architecture describes for each medium: (1) the specification of the elements, (2) the possible access functions and, (3) the data coding. Individual elements are the Logical Data Units (LDUs), which are determined for each medium.
The access functions serve for the manipulation of individual elements. The coding of the data determines the mapping with respect to bits and bytes.

10.ODA has content architectures for media text, geometrical graphics and raster graphics. Contents of the medium text are defined through the Character Content Architecture.
The Geometric Graphics Content Architecture allows a content description of still images. It also takes into account individual graphical objects.
Pixel-oriented still images are described through Raster Graphics Content Architecture. It can be a bitmap as well as a facsimile.

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