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Help with Derived Types

From: Wise, Bowden (Research) <wisegb@crd.ge.com>
Date: Tue, 30 Jul 2002 18:21:59 -0400
Message-ID: <FBE90DFC240BA541B38A43F39913A16D02D419CD@xmb02crdge>
To: "'xmlschema-dev@w3.org'" <xmlschema-dev@w3.org>


Hi

I am developing a schema for a tree-type structure:
   LF -> LFHeader, LFContext, LFNode

The idea being that different applications will derive their own types
for the header, context, and nodes.  

e.g, one application would define:

  LF from MYLF
  MyHeader from LFHeader
  MyContext from LFContext
  MyNode from LFNode

What would be the best way to define a base schema and
derived schemas? I welcome any suggestions...

I thought I could use substitutionGroups and the extension mechanism
but whenver I try and parse an instance of a derived class, I get
errors.

The first thing I tried was to replace the LFHeader with SequenceHeader
otherwise the schema is the same, but I get this error:

org.xml.sax.SAXException: unable to find FieldDescriptor for 'SequenceHeader' in ClassDescriptor of
LF
	at org.exolab.castor.xml.UnmarshalHandler.startElement(Unknown Source)

I have attached a txt file that has all the various schema definitions.  I don't
understand why I am unable to substitute the SequenceHeader element for
the LFHeader element?
 <<ALL.txt>> 
> Bowden
> g GE Global Research Center 
> ___________________________________________________________________________________________________
> ________________
G. Bowden Wise
mailto:wisegb@research.ge.com
Information and Decision Technologies
GE Global Research Center
Building K1, Room 5B2C
PO Box 8                            | One Research Circle
Schenectady, NY 12301       | Niskayuna NY 12309
Phone: 518-387-7833           | Fax: 518-387-6104




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`
end
Received on Tuesday, 30 July 2002 18:24:07 UTC

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