Generating a modified schema.

[kelvin goodson <ke...@gmail.com>]

The JIRA http://issues.apache.org/jira/browse/TUSCANY-1358 was raised
to help one of the community to understand how to load a schema, and
use the Types to generated a modified schema.  I'm transferring the
discussion here to the users' list as I don't think this is a bug,
and the rest of the community will benefit more if the discussion is
played out here.

The issue reported is that Tuscany SDO explicitly blocks regenerating
a schema from types that were generated from a schema.  Whatever the
reason for this explicit blocking,  there are other issues here.
First off is that the types generated by the XSDHelper.define call
will be immutable,  so if the intention is to change the detail of
those types then other blocking problems will occur.  The Types are,
and need to be, immutable;  since allowing the possibility of altering
a Type would undermine the integrity of existing instances of that
Type.

I think the reporter is perhaps trying to stretch SDO to something
it's not intended for,  but I can see two approaches to generating a
modified schema using SDO.

The first would be to use the SDO metadata API's to traverse the type
system generated by the XSDHelper.define call,  and to create a data
graph composed of DataObects of type commonj.sdo#Type and Property,
then make the appropriate changes to reflect the required alteration
to the metadata, and use this graph to submit to TypeHelper.define.
The type system generated by the TypeHelper.define call could then be
used to generate a modified version of the XSD using
XSDHelper.generate().

The second approach would be to load the schema as a data graph, and
traverse that graph, (as opposed to the Type system as described
above).  Again the traversal process would be used to create a new
data graph of DataObjects of type commonj.sdo#Type and Property and
the result be submitted to TypeHelper.define, and the resultant types
submitted to XSDHelper.generate.

Regards, Kelvin.

---------------------------------------------------------------------
To unsubscribe, e-mail: tuscany-user-unsubscribe@ws.apache.org
For additional commands, e-mail: tuscany-user-help@ws.apache.org