期刊名称：International Journal of Computer Science & Applications
印刷版ISSN：0972-9038
出版年度：2006
卷号：III
期号：II
出版社：Technomathematics Research Foundation
摘要：The explosion of the number of web-based information sources has drastically
increased the need for intelligent mediation tools to be implemented between the
users and these information resources. These tools must overcome the limitations
of the current search engines while making it possible for the users to submit more
sophisticated queries than simple key words. On the other hand, we can
incorporate brief replies coming from various sources to build total responses to
the users’ queries. This technique is based on the integration of heterogeneous
information sources.
The central problem of information sources integration resides on their
heterogeneity on the level of their format, the design and/or the semantic aspect. It
is not possible to change these existing sources in order to make them
homogeneous (for example XML or others). But, building a mediator on the top of
these sources can solve the problem and allows a to query an information system
which is centralized and homogeneous.
In this paper, we will present and illustrate the various approaches which we
followed for the design and the development of an Advanced Xml Mediator
(AXMed). The goal of this mediator is to ensure an integration of several resources
of non-materialized heterogeneous data. The AXMed design which we propose is
based on application domains specification. This system of mediation represents
the fruit of a thorough research of internal architecture and the existing operating
mode of several mediators, namely Médience, LeSelect, Tsimmis, Agora, etc.
The AXMed architecture system provides uniform access to the mentioned kind of
data sources. The advantage of this system is very easy to configure and maintain
by writing simple XML files, describing the structure and mapping of a new
source. Indeed, adding additional data sources does not need restarting and
redefinition of the system core.
