[TUSCANY-1113] Extensible namespaces and types that change

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Java-SDO-beta1
• Component/s: Java SDO Implementation
• Environment: Eclipse, EMF 2.2.1
• Assignee: Unassigned
• Reporter: Christian Landbo Frederiksen
• Created: 14/Feb/07 18:27
• Updated: 19/Sep/10 11:24
• Resolved: 27/Feb/07 20:49

Description

Once an xml-schema with a namespace is defined (XSDHelper) you cannot define other schemas with the same namespace.
I would like namespaces to be extensible.

Once the types of a schema is defined you cannot change them by defining an altered version of the schema.

I realize the dangers of modifying already defined types but I believe i ought to be an option.

Summary from: http://www.mail-archive.com/tuscany-user%40ws.apache.org/msg00624.html

An xml schema is uploaded and SDO is used to generate a form for
submitting data as xml-instances of the schema.
New schemas in the same namespace may be added often resulting in new
forms (this is the first issue where I need to extend existing
namespaces).

Xml instances may later be edited again.
This is the most common use case and SDO seems to support this very
well.

BUT xml schemas may be modified, even individual types.

This of course flagged some warning signs and schema versions were
considered.
But 'use at own risk' was chosen because of its simplicity. To support
this strategy a status/mode will be introduced so xml-instances cannot
be edited while schema is in 'administration'-mode. This ought to handle
the case with instances at schema-modification time.

With regards to serialized xml instances any data that is rendered
invalid with type changes will be reset/deleted as of design.