Delivering Targeted Information
Before XML, complex Web sites that deliver targeted information to users were built using scripting and RDBMS technology. If a company wanted to host an online monthly newsletter, for instance, a programmer developed a database schema to contain the articles, advertisements, and editorial information. Then he developed a Web application that could display data from the database and possibly allow users to dynamically update the database. If the structure of the newsletter needed to change, the underlying schema had to be modified, and any scripts dependent on the schema had to be fixed as well.
This programmer/DBA intensive approach created several problems:
Systems either lacked flexibility or were extremely complex. ...
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