Databases Reference
In-Depth Information
10
Management and Multimedia
Presentation of Heterogeneous
Documents
Kazumasa Yokota
Takeo Kunishima
Akiyoshi Matono
Okayama Prefectural University
Bojiang Liu
Okayama University of Science
ABSTRACT
XML (extended Markup Language) has become almost de facto standard for
structuring digital documents and been being extended to cover multimedia
information by efforts of many languages such as SVG, X3D, and VoiceXML.
However, such extensions are limited under the syntax of XML, which is not necessarily
appropriate for users' semantics-oriented treatment such as representing relationships
among objects and attaching memos to shared documents. In this article, we consider
another approach to treat semantically extended management of XML-based
documents to cope with various applications. As our approach focuses on not only
semistructured data but also structured data such as complex objects, conventional
query processing can be also applied to a set of documents. Further, by introducing
logical elements, it is also useful for reducing design heterogeneity and content-based
classification.
1
Introduction
With rapid advances of computers and networks, almost every information has
been being digitalized. Among them, a concept of
digital document
plays a central
role: that is, it does not necessarily correspond to the form of paper, but includes
not only texts and pictures but also movies, programs, and even virtual worlds. In
other words, digital documents are essentially multimedia-based and, therfore,
their models and presentation methods have to be reconsidered, differently from
conventional documents'.
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