[Wasabi Proposal] XML desktop query language

[Mikkel Kamstrup Erlandsen]

I updated the proposal (and wiki examples) with the following to reflect
recent discussions (some where off-list, sorry):

 - Allow to embed the user level language in a query
 - let the stemming enablement be undefined by defualt
 - Allow a language hint on strings
 - Introduce a fullText selector, for searching in "all fields where it
makes sense"
 - A "type" attribute on the query element specifying the type of objects to
look for - fx "music" or "video". The names of the types still have to be
settled upon in the metadata spec - these will also be available through the
end-user language

Outstanding Issues:
 - Should we have an XOR selector?
 - Should we allow multiple words in the proximity selector (left out
because it has some ambiguitites right now)?
 - Is the way of negating an expression ugly? Right now you specify the
attribute negate="true" of a collectible ("and", "or" or a selector type).
See 3rd example on wiki.
 - Specify the end-user language

Cheers,
Mikkel
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