If you were to pause and make a list of all the formats
available just for web newsfeeds the benefits of not having to deal with that range and rate of change would be
clearly illustrated.
Before we get into using the Zend Framework components we??™ll take a look at the how??™s and why??™s of
integrating applications using web services.
11.1 Integrating Applications Together
It is interesting just how much web services have become a part of our offline and online existence. Every time
I start up my computer my newsreader fires up and digests a list of XML formatted news from sites that I
could never have been able to keep up with otherwise. Recently my wife sold some of the clutter from our
garage using GarageSale, a Mac OS X desktop application that talks to eBay using its XML based API
(Application Programming Interface) over HTTP. The key to all of these actions is the exchange of
information across a network and the distribution of the computing.
11.1.1 Exchanging structured data
XML stands for Extensible Markup Language and originates from Standard Generalized Markup
Language (SGML) which is one of the many markup languages whose role is simply to describe text. Probably
the most well know is HTML (HyperText Markup Language) which describes text documents that are
intended to be transmitted by HTTP.
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