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> In other words, it's useful for elements to have identifiers for
> their class as well as their own nature, a genera as well as a
> species. Very few people talk about this, but it is far and away the
> most important use of namespaces.
What also goes unrecognized is the side effect of an implicit associative
authority inherent in using a URL as a namespace id. People will assume
(with some justification) that namespace ids beginning with
"http://www.widgetco.com" will only be associated with components,
definitions, semantics, and documents that have been vetted by Widget Co.
Anybody outside of the company who's making up their own associations with
such ids are borderline con artists, and run the risk of having them
collide with later associations made by the company itself.