Hi Eitan,
I don't think it's used any more. Perhaps the JDO team uses it, but it's
not used on the XML side.
For Castor XML, we currently support container objects. A container
object is an object that does appears in the Java object model, but does
not have a direct representation in the XML, yet it's children do.
An example of a container might be a collection, such as a Vector or
Array, where only the items in the collection should be marshalled.
Simply use <field ... container="true"> to indicate the field is a
container.
We plan on supporting container elements also, but we do not yet have
anyone working on it.
Container elements are elements that appear in the XML, but that do not
have a direct object representation, while it's children map to fields
in the parent of the container element.
Thanks,
--Keith
Eitan Suez wrote:
>
> hi,
>
> i am trying to understand the concept of the
> <container> element & accompanying attribute in a
> mapping file.
>
> can someone who does understand this and who does
> have a little spare time provide an explanation?
>
> from the mapping schema, i infer that a field can
> be marked with container="true|false"
>
> q1: what is the significance of this 'marker'?
>
> also, a class element can have an optional reference
> to a container. the definition of the container
> element is very similar to that of a field, with
> attributes such as name, type, required, direct,
> get-method, etc..
>
> so i assume that a class can be contained by another
> class and information about the containing class
> and how to access it from the "contained" class can
> be described in the mapping.
>
> what i lack in understanding this mechanism is the
> underlying purpose and utility.
>
> an example would probably clarify things for me.
>
> thank you in advance.
>
> / eitan
>
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