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From "Jukka Zitting" <>
Subject Re: dtd for custom_nodetypes.xml
Date Mon, 26 Feb 2007 08:51:31 GMT

On 2/26/07, ruchi goel <> wrote:
> OK.  But if you want to check if a nodetype is already registered, ( and
> reregister or do not register depending on your requirement) , you still
> need to iterate and register nodes one by one.So, what s the advantage
> of     manager.registerNodeTypes(xml,
> JackrabbitNodeTypeManager.TEXT_XML);   as opposed to
> ntReg.registerNodeType(def);
> I understand that manager.registerNodeTypes(xml,
> JackrabbitNodeTypeManager.TEXT_XML);   can register in one shot , but
> may be it is a good idea to use it at the end of development , when you
> know you will not be registering or reregistering the nodes again and again.

You could achieve the same effect by putting each additional node type
(or set of them) in a new node type definition file. But you're right,
the JackrabbitNodeTypeManager interface is (intentionally) not as
powerful as the underlying NodeTypeManagerImpl and NodeTypeRegistry

The problem with your approach is that it requires explicit care from
the node type definition writer to put the definitions in such an
order that any dependencies between types are correctly ordered and
that there are no circular dependencies.

Another problem is that there are no guarantees that the internal
methods (or their semantics) remain the same across Jackrabbit
releases, as we only guarantee backwards compatibility for the JCR API
and the extension interfaces defined in jackrabbit-api.

More generally, the node type management support in Jackrabbit is
still quite limited, i.e. you're restricted to just adding new types
and making only trivial changes to existing types. Thus, during
development I generally recreate the entire test repository when I
need to make changes to my node type definitions. Obviously this is a
poor solution when you need to upgrade production repositories. :-(


Jukka Zitting

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