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services technology, which exchanges information as messages represented in
XML format. See Figure 2-1.
Real-Time Traffic Application
Real-Time Traffic Application
Client Application
Client Application
Internet
http://www.xtraffic.com
http://www.xtraffic.com
Internet
XML
XML
Client
Client
Traffic Warning Application
Traffic Warning Application
Client
Client
http://www.xtrafficwarning.com
http://www.xtrafficwarning.com
Figure 2-1 Web application XML: connecting each other
XML is so powerful and so flexible that people use it not only as a document but
widely use it to:
Describe the meta content of the Web resources. Resource Description
Framework (RDF) is such an example, which is an XML representation of
resource described uniquely on Web. The popularity of semantic Web
technology is fueling the growth of rich metadata being defined on Web
contents.
Publish and interchange database contents. Sharing data between
applications is a necessity. Finding a common ground and different parties
agreeing to it is only possible through XML and XML schema.
Communicate with message format. Business-to-business (B2B) applications
use XML-based messaging to communicate.
So, why use XML? Well, for simplicity, richness for data structure, and its
versatility (handling of international characters). Today, database vendors
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