[sdo] [NEW ISSUE] Access to local properties by global properties

[Frank Budinsky <frankb@ca.ibm.com>]

Moving this issue from JSR235 to SDO 3. 

As we have discussed in JSR235, depending on how we answer this, it may be 
the solution to the substitionGroup issue: SDO-65.

I guess this question is also related to SDO-67.

Frank

----- Forwarded by Frank Budinsky/Toronto/IBM on 08/15/2008 02:48 PM -----

"Buennig, Stefan" <stefan.buennig@SAP.COM> 
Sent by: Java Community Process JSR #235 Expert List <JSR-235-EG@JCP.ORG>
08/14/2008 07:36 AM
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Java Community Process JSR #235 Expert List <JSR-235-EG@JCP.ORG>


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Subject
Access to local properties by global properties






Hi all, 
the discussion about substitution groups raised the following question: 
Should we allow to access local properties (that are defined on the type) 
by global properties? 
In my opinion this would cause further difficulties. 
Let's start with the following schema: 
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; elementFormDefault
="unqualified" attributeFormDefault="unqualified" targetNamespace="
http://tns"; xmlns:tns="http://tns";>
        <xs:element name="foo" type="xs:string"/> 
        <xs:element name="root" type="tns:T"/> 
        <xs:complexType name="T"> 
                <xs:sequence> 
                        <xs:element ref="tns:foo"/> 
                        <xs:any maxOccurs="unbounded"/> 
                </xs:sequence> 
        </xs:complexType> 
</xs:schema> 
I think everyone agrees that we get an open type T with a single valued 
property "foo". 
We get also a global property "foo" in our target namespace. 
If we would allow to access the local "foo"-property by the global 
"foo"-property, we had no distinction between defined and open content.
How can the user create the following valid XML by the SDO API? 
<tns:root xmlns:tns="http://tns";> 
        <tns:foo>defined</tns:foo> 
        <tns:foo>open</tns:foo> 
</tns:root> 
Is there a common sense that the content of the root-DataObject is 
represented by a single-valued defined "foo"-property that holds the value 
"defined" and a many-valued open content "foo"-property that holds a list 
with a single String item "open"?
I think we should start with clarifying that simple case before we 
continue the discussion about substitution groups. 
Stefan. 
Stefan B�nnig
Senior Developer
NetWeaver C Tools 

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