Re: [ws-caf-editors] context model

[Greg Pavlik <greg.pavlik@oracle.com>]

My comment in private (I suppose this is still private) to Mark was that in my opinion a formal model and a UML diagram are very different, and we really need to focus on the former. At best, the diagram aids someone in understanding the model description. In this case, I think the text and diagram should be in the same document, since the diagram shows cardinality of relationships, but the relationships themselves are spelled out with their meaning and semantic implications in the text.

The activity identifier in the text may be my blunder -- I'll have to double check -- the ContextType has a context-identifier, which I have always assumed maps to the identity of the activitiy. If that's correct, perhaps we can just say so?

For refreshers, here's the context service schema:

    <xs:complexType name="ContextType">
        <xs:sequence>
            <xs:element name="context-identifier" type="xs:anyURI"/>
            <xs:element name="activity-service" type="xs:anyURI" minOccurs="0"/>
            <xs:element name="type" type="xs:anyURI" minOccurs="0"/>
            <xs:element name="activity-list" minOccurs="0">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="service" type="xs:anyURI" minOccurs="0" maxOccurs="unbounded"/>
                    </xs:sequence>
                    <xs:attribute name="mustUnderstand" type="xs:boolean" use="optional" default="false"/>
                    <xs:attribute name="mustPropagate" type="xs:boolean" use="optional" default="false"/>
                </xs:complexType>
            </xs:element>
            <xs:element name="child-contexts" minOccurs="0">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="child-context" type="tns:ContextType" maxOccurs="unbounded"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="timeout" type="xs:int" use="optional"/>
    </xs:complexType>


Greg
 (ps it's amazing how unhelpful UML when you try to say talk about things that aren't classes, objects or actors).

Martin Chapman wrote:

what is the relationship between activity identifier and context? the
text implies a realtionship yet its not on the diagram. also I sugest
that rather having a note saying that activities can be nested, that
there is an self refernceing association on  activity.

Martin.

  

-----Original Message-----
From: Mark Little [mailto:Mark.Little@arjuna.com] 
Sent: 09 March 2004 22:16
To: ws-caf-editors@lists.oasis-open.org
Cc: mark.little@arjuna.com
Subject: [ws-caf-editors] context model


Here's the context model we seem to have agreement on so far. 
If you can take 
a quick look and let me know of anything that you think needs 
qualifying, I'll 
send it to the main group. I want to then follow up with 
email explaining the 
diagram (basically the text we've already got). From there we 
can persue some 
of the other issues (such as removing status types, context 
as one block in 
the SOAP header or one entry per ALS, ...)

Mark.

----
Mark Little,
Chief Architect, Transactions,
Arjuna Technologies Ltd.
 
    

www.arjuna.com