Hi,
Gianugo Rabellino wrote:
> Guys,
>
> please *don't* use the XMLDB generators. They are going to be deprecated
> RSN, since they are replaced by the much more powerful Source
> abstraction that allows to use plain XMLDB URIs to retrieve documents
> and, yes :), XPath-query the collections :)
>
> Usage is straightforward: put the correct DB configuration in
> cocoon.xconf and use xmldb:// URLs wherever you want in the sitemap :)
>
> If you are willing to do XPath queries all you need is to use an
> xpointerish syntax such as:
>
> xmldb:xindice://my.host.name/my/collection/#//my/xpath[@query]
>
> Please also note that for the brave ones there is also an ongoing XMLDB
> transformer worth noticing in scratchpad.
>
> HTH,
I see one problem with the source concept, if you are retrieveing lots of
resources from the same collection. There are three steps to
get a resource from xindice;
1) register database
2) get collection
3) get document
Typical performance numbers are:
1) Need 158.0 ms for Database.
2) Need 1962.0 ms for Collection.
3) Need 294.0 ms for Document.
Time for 1) drops dramatically after the first call.
Time for 3) is unavoidable. Time for creating a collection drops too, if you
call it more than once, but is still high. So you want to keep the collection
open, if you need to get documents from this collection often.
You could configure a generator to cache a collection.
That does not work with current implementation, but it would be straight
forward to add. I can't see, how to add this capability to the source URL.
Regards
Martin
--
Martin Holz <[EMAIL PROTECTED]> phone: 0049-30-39977 218
FIZ CHEMIE BERLIN
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