Example: Discussion


  1. 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.
  2. The isNearTo function has to check against a geographical database, but here too the information is in XML, and the source is not important.
  3. 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.