Re: Collection Creation Ques

Hi,

> I need to make use of some Collection management services such as creating
> a Collection under the root collection, etc. I came across the service
> "LocalCollectionManagementService" which I believe is located in
> org.xmldb.api.reference.modules.*
>
> However, when I import the above package, I get a compile time error saying
> this package does not exist.
>
> Ques #1: where can I find the relevant package? Where is this jar file and
> what is it? Do I need to download the jar file from some other source or
> does it come with the eXist download?

Use org.xmldb.api.modules.CollectionManagementService. The jar is xmldb.jar 
and is in lib/core.

> Ques #2: this is the code that I am using to create the Collection:
>
> LocalCollectionManagementService service =
>      (LocalCollectionManagementService)
> root_col.getService("LocalCollectionManagementService", "1.0");
>
> rsc_col = service.createCollection("resources");
>
> where, root_col is the root Collection here and the resources Collection
> i.e. rsc_col is intended to be created under the root.
>
> Is this the most appropriate way to create a Collection or are there some
> other services?

The code will be correct if you use CollectionManagementService instead of 
LocalCollectionManagementService.

> Ques #3: Unrelated question. My Java client uses the embedded instance of
> the server. I am curious to know where are the documents (that are added to
> the server such as XML files) stored on the local machine? Also, if my
> client adds say an XML file during one instance, then shuts down, then
> re-starts, can the client have access to this XML file that was stored
> previously?
>
> I currently use:
> Database database = (Database) cl.newInstance();
> Since a new instance is created, I am wondering if the files are stored in
> a persistent state to be retrieved later.

Sure, the documents are stored in the database backend (whose files reside in 
webapp/WEB-INF/data). But you won't find your .xml file there. eXist stores 
the document model, not the raw XML. It also creates a bunch of indexes on 
the data, which are persistent as well.

Compare it to a relational database: would you expect it to store your tables 
as a text file in the file system? Certainly not. Documents roughly play the 
same role for eXist as tables in an rdbms. They are logical, not physical 
entities.

Wolfgang

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