Linda van den Brink wrote:

> Maybe it would be possible for search engines to use something
> like this? People would then be able to use tag names in the language of
> their choice, while the search engine would know from the 'tag database'
> that <auteur> is the same as <author>...

Current bandwagon solutions to this are based on something called "Namespaces"
(now a Proposed Recommendation at the W3C).

I know of some knowledgeable folks who deem Namespaces error-prone and

They cite as the alternative a proven mechanism known as "Architectural Forms".