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Subject: Groups - Proposal - Containment and Enterprise Data Models (SDO-EnterpriseDataModel.doc) uploaded


This is the containment proposal I mentioned during the conference call on
April 1, 2008.

 -- Mr. Blaise Doughan

The document named Proposal - Containment and Enterprise Data Models
(SDO-EnterpriseDataModel.doc) has been submitted by Mr. Blaise Doughan to
the OASIS Service Data Objects (SDO) TC document repository.

Document Description:
The SDO spec to date has primarily concerned itself with deriving SDO
metadata from XML schema.  As such containment has come to represent the
concept of nesting as it relates to XML elements.  We prefer to think of
containment as a type of "privately owned" concept.  For the association
"residence" between types "Employee" and "Address" if instances of
"Employee" may not share references to instances of "Address" then it is a
containment relationship:  
 
Containment:  employeeDO1.get("residence") == employeeDO2.get("residence");
 // This can never be true
Non-Containment:  employeeDO1.get("residence") ==
employeeDO2.get("residence");  // This can be true
 
Using the above interpretation of containment it becomes easy to derive SDO
metadata from other sources, such as JPA entities, JAXB objects, relational
databases, etc. (the doc provides an example of deriving SDO metadata from
a relational database).  These sources may not have a concept of nesting,
but they are aware of data sharing rules.  Of course DataObjects require an
XML representation, and containment has been an important part of that. 
The attached proposal contains an algorithm that makes use of containment
properties when they are present and handles things when they are not.

View Document Details:
http://www.oasis-open.org/apps/org/workgroup/sdo/document.php?document_id=27848

Download Document:  
http://www.oasis-open.org/apps/org/workgroup/sdo/download.php/27848/SDO-EnterpriseDataModel.doc


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