Channel Definitions
One of the first real time applications of XML is the Channel Definition Format developed
by Microsoft for defining channels. A user can include shortcuts to his favorite web sites
through Channel Definitions. These channels notify the user whenever any critical
information has been changed in the web sites. This process is known as Webcasting or
push.
A Channel Definition Format is defined in a separate file whose extension is.cdf. A cdf file is a pure XML file, which contains links to HTML documents. The CDF file need not be an addition to a web site. The site may contain a link to the CDF file. When the user traverses through the link a copy of the channel index is downloaded to the user's machine. At the same time an icon is placed in the channel bar which links to the contents of the channel.
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