Markus, great news! Looks like switch to 1.12 is inevitable for me ;)
I think speed optimizations might be even more important, especially for
some large sites (hint-hint).
I wonder if "formats" idea I described in addition to "Concepts" to further
minimize URLs makes sense - in any case, I'll start by testing default
concept titles and descriptions first.
Sergey
On Mon, Jul 7, 2008 at 4:51 AM, Markus Krötzsch <
[EMAIL PROTECTED]> wrote:
> SMW 1.2 extends the options for controlling which queries users are allowed
> to
> ask, and it has a mechanism that can be used to let some users ask more
> than
> others ("permissions").
>
> The detailed query control settings are achieved by the new configuration
> parameter $smwgQFeatures. This parameter defines which query features are
> allowed in #ask. The default is the following:
>
> $smwgQFeatures = SMW_PROPERTY_QUERY | SMW_CATEGORY_QUERY |
> SMW_CONCEPT_QUERY |
> SMW_NAMESPACE_QUERY | SMW_CONJUNCTION_QUERY |
> SMW_DISJUNCTION_QUERY;
>
> This allows all existing features to be used. Other possible settings could
> be:
>
> only category intersections:
> $smwgQFeatures = SMW_CATEGORY_QUERY | SMW_CONJUNCTION_QUERY;
>
> only single concepts: (see earlier mail on concepts)
> $smwgQFeatures = SMW_CONCEPT_QUERY;
>
> anything but disjunctions:
> $smwgQFeatures = SMW_ANY_QUERY & ~SMW_DISJUNCTION_QUERY;
>
> So you can very clearly customise SMW queries. This affects only the #ask
> queries. Queries stored as concepts have their own setting, called
> $smwgQConceptFeatures. For example, concepts currently are not allowed to
> refer to other concepts (recursion is not handled properly by SMW yet).
>
> This gives you a way to restrict query creation to some user group of the
> wiki:
>
> * set $smwgQFeatures = SMW_CONCEPT_QUERY;
> * configure MediaWiki to have the Concept: namespace being editable only by
> some user groups (there are extensions for that, I have no further details
> here, search the web).
>
> Then #ask queries can only use single concepts and not be used to invent
> any
> new queries. So you can have very complex queries, but have responsible
> people creating them and making sure they are fine and fast in the wiki.
> You
> can also set $smwgQFeatures = SMW_CONCEPT_QUERY | SMW_CONJUNCTION_QUERY; to
> allow for conjunctions of multiple concepts, if desired, or you can further
> include categories. This appears to be a good option especially for very
> large sites that cannot afford users toying around with arbitrary queries
> for
> reasons of performance. This restriction was not tested thoroughly yet (so
> do
> not rely on this performance safety).
>
> Restricting complex queries to concept will become even more useful as soon
> as
> SMW 1.3 offers concept-specific caching (e.g. some concepts being
> precomputed
> in the database so they can be recalled like categories). Category caching
> was originally planned for SMW 1.2 already, but we decided to first
> introduce
> concepts and then have a general caching mechanism for them. In this way,
> all
> queries will be cacheable and scale to any site that is able to display
> categories. Wikipedia comes to mind. But one more release is needed for
> that
> to be done properly.
>
>
> Cheers,
>
> Markus
>
> --
> Markus Krötzsch
> Semantic MediaWiki http://semantic-mediawiki.org
> http://korrekt.org [EMAIL PROTECTED]
>
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--
Sergey Chernyshev
http://www.sergeychernyshev.com/
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