getting the document (global type) on-the-fly from content types

[Matthew Young <ma...@forsakringskassan.se>]

will try my best to describe my managing of XMLBeans as clear as possible
(...mission impossible)...

using DB2 Viper (9) which allows for XML columns.  have tables with mixed
content (book keeping stuff in normal tabular columns and detailed - ITIL -
information in XML columns).  using Hibernate as my DAO broker and for XML
columns have created a user type which reads in the XML column data as
string and through the XmlObject.Factory.parse pumps into the corresponding
POJO a XmlObject (which is a XmlBeans document i.e. inclusive the schema).
the POJO objects trickle up through a service layor and finally out with DWR
into an Ajax web application.  pretty smooth since everything to the Ajax
components is a giant POJO (or JSON object in the javascript world).

problem is this: the data i model represents ITIL elements (i.e. resources
like servers/databases/etc.).  these resources are subclassed into a huge
heirachy whereby at the top i have a baseElement class.  when working with
XmlBeans i have designed my schemas so that resources down the ITIL tree
extend from a couple core schemas and the schema standing for the
baseElement (ancestor class).  everything works fine until i want to do
similar subclassing of the POJOs in Java from their direct parent because i
am tranforming the XML column data into XmlBean documents (not the content
type - or root).  for example, if i have a package bean (POJO) with a XML
schema that extends the software bean's schema which has baseElement as an
ancestor right now my POJO just extends the BaseElement POJO (which has no
XML columns mapped in it's Hibernate XML configuration - only the subclassed
POJO have XML properties) since the XmlBean Documents do not inherit from
each other (for obvious reasons - different namespaces).  if i could
transform in my Hibernate user type "on-the-fly" directly to the content
type (root) into a POJO property then the POJOs could extend each (mirroring
the schema hierachy).

not sure how to within the Hibernate user type upon reading the XML column
data (string which i must have the global element type i.e. a complete XML
document) suck out the content type (root) in a general way.  remember the
data about resources is in the same table (called baseelement) with a
discriminator column (called type) and houses different schemas in it's XML
columns.  so in the Hibernate user type i get the schematype by parsing and
know it is a document but no clue how to pull the root?

same problem when persisting.  if my POJO just carry the content type when
saving the Hibernate user type must first add the content type (root) to a
new document and finally write (xmlText) that object into the XML data
(otherwise i don't get my global type and essentially have no idea what the
owning schema is).  need some dynamic way to associate content types to
documents.

simple description?  right.  any suggestions would be killer.
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