Collection - code question.

[Damien Dudouit <da...@ssl.co.uk>]

Hello all,

That's my first question on the list. You might find it slightly bizarre but if one of you
could reply it in a couple of sentences, I would be really greatful.

I have been trying to understand to core code of Xindice's filer
(org.apache.xindice.core.filer) and I don't understand how physically collections are held
down in the B+Tree.
Is a key (of an XML document) unique only within a collection? i.e, does each collection
use a separate BTree inside of a unique file?
The file consists of a header and pages, some holding records, some holding the
simple-prefix indexes. Where physically are the collection structure held?

Many thanks in advance,

Damien

Re: Collection - code question.

[Kimbro Staken <ks...@xmldatabases.org>]

On Wednesday, April 17, 2002, at 09:42 AM, Damien Dudouit wrote:

> Hello all,
>
> That's my first question on the list. You might find it slightly bizarre 
> but if one of you
> could reply it in a couple of sentences, I would be really greatful.
>
> I have been trying to understand to core code of Xindice's filer

I'm not really an expert at this code but I'll take a stab.

> (org.apache.xindice.core.filer) and I don't understand how physically 
> collections are held
> down in the B+Tree.
> Is a key (of an XML document) unique only within a collection?

Yes.

> i.e, does each collection
> use a separate BTree inside of a unique file?
>
Yes.

> The file consists of a header and pages, some holding records, some 
> holding the
> simple-prefix indexes. Where physically are the collection structure held?
>

The collection hierarchy is mirrored in the file system under the db 
directory and the collection configuration is stored as XML in a 
collection system/SysConfig.

> Many thanks in advance,
>
> Damien
>
>
>
Kimbro Staken
Java and XML Software, Consulting and Writing http://www.xmldatabases.org/
Apache Xindice native XML database http://xml.apache.org/xindice
XML:DB Initiative http://www.xmldb.org