Example: Discussion
- The query doesn't mention the source types.
The query writer has no need to know how the data is stored,
nor how to interface with it.
- The isNearTo function has to check against a
geographical database, but here too the information is
in XML, and the source is not important.
- The CGI script can be maintained by one person, the
XML Query templates by another, and if necessary, the
design and layout can be done by yet a third person.
