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Subject: RE: AW: [sdo] ISSUE 124: Another attempt


IMO, the 2.1 spec is clear that the root of the serialized document is "2":

save(DataObject dataObject, String rootElementURI, String rootElementName)
returns the DataObject saved as an XML document with the specified root

It refers to "the DataObject" rater than "the root of the data graph containing the DataObject". I think that serializing the root would be surprising to the user; he/she can achive that effect by calling save() on dataObject.getRootObject().

Now of course somebody may claim that serialization of orphans is inconsistent with serialization of the "main" tree, but for orphans I don't think we have a choice (unless we want to potentially duplicate the orphans).

So I agree with this proposal; I would have also preferred the orphans property not be "special" (the same way that the change summary property is not special, it's exactly the same thing), but I thought we ruled this out in the May-06 meeting.


> -----Original Message-----
> From: Frank Budinsky [mailto:frankb@ca.ibm.com] 
> Sent: Wednesday, May 07, 2008 9:59 AM
> To: sdo@lists.oasis-open.org
> Subject: Re: AW: [sdo] ISSUE 124: Another attempt
> Hi guys,
> I agree that we need to clarify the question about what is 
> the root (1 or
> 2) in this example.
> I like the proposal, but wonder if instead of just saying 
> that the orphan element in Type {commonj.sdo}DataGraph has 
> this special serialization behavior, we could create a new 
> annotation, e.g., {commonj.sdo/xml}orphanHolder, which can be 
> used anywhere to get this special behavior using any suitable 
> user-defined property.
>     <xsd:element name=?orphans? type=?xsd:anyType? 
> sdox:orphanHolder="true" minOccurs=?0? maxOccurs=?unbounded?/> 
> Frank.
> "Barack, Ron" <ron.barack@sap.com>
> 05/07/2008 12:25 PM
> To
> "Christophe Boutard" <christophe.boutard@xcalia.com>, 
> <sdo@lists.oasis-open.org> cc
> Subject
> AW: [sdo] ISSUE 124:  Another attempt
> Hi Christophe,
> The first part of your question is maybe something that 
> should be addressed in the JSR 235 group, it seems to be 
> unclear in the spec.  I would have expected that the object 
> provided by the user is the data graph's root object (or the 
> child of the root object, if you consider the 
> wrapper supplied by data graph).   I would have expected the 
> business root 
> is contained by the DataGraph, effectively detached from your 
> node "1".
> Whether "1" should be serialized is somewhat orthogonal to 
> the rest of the discussion.  I would say that 3.0 should be 
> consistent with 2.1.1.
> For the orphan object, yes, this is exactly what I am saying. 
>  The actually "orphan" is node "5".  Node "7" is serialized 
> only as a part of serializing node "5".
> Ron
> Von: Christophe Boutard [mailto:christophe.boutard@xcalia.com]
> Gesendet: Mittwoch, 7. Mai 2008 09:12
> An: Barack, Ron; sdo@lists.oasis-open.org
> Betreff: RE: [sdo] ISSUE 124: Another attempt
> HI Ron, everyone,
> First of all your proposal sounds good to us.
> I?ve added a picture to this email in order to be sure of the 
> expected behavior when you pack objects into a data graph.
> So here is the scenario:
> I would like to pack my data into a data graph and the object 
> provided by the user is ?2?.
> I expect that ?1? will be considered as the business root 
> because it is the container of ?2?.
> Then ?4? will be added to the orphans list.
> It should be the same for ?5? even if the referenced object 
> is ?7?. The thing is that ?7? is referenced by containment 
> and should not be considered as orphan.
> In that case we have to retrieve the first object without 
> container and mark it as orphan. In our case it is ?5?.
> I hope everything is clear?
> Thanks,
> --Christophe
> De : Barack, Ron [mailto:ron.barack@sap.com] Envoyé : 
> mercredi 7 mai 2008 16:34 À : sdo@lists.oasis-open.org Objet 
> : [sdo] ISSUE 124: Another attempt
> Hi Everyone,
> In Tuesday's call there seemed to be some consensus that performing a
> XMLHelper.save() operation using a {commonj.sdo}DataGraph as 
> an argument should never throw a GraphNotClosed exception.  
> That is, DataGraph should act as a technical root, and any 
> orphans referenced but not contained in the DataGraph?s 
> business root should be serialized as children of the DataGraph. 
> I've been looking at trying to make a proposal out of this.  
> It seems to me the most natural place to describe this 
> behavior is in Chapter 12, which deals specifically with the 
> XML serialization of DataGraphs.
> I would like to add the following paragraph at line 3424 
> (based on the word document 
> http://www.oasis-open.org/apps/org/workgroup/sdo/download.php/
> 26863/OASIS%20SDO%20For%20Java%20Spec.doc
> )
> ________
> The serialization of a DataGraph, whether invoked through a 
> DAS or java.io.Serializable or in a Web service, includes the 
> transitive closure of all DataObjects reachable from the 
> DataGraph?s root object, whether or not the DataObject are 
> contained, directly or indirectly, by the root DataObject.  
> DataObjects that are referenced but not contained must be 
> included in the ?orphan? elements that are part of the 
> DataGraphs XML representation.  Each ?orphan? element is 
> serialized as part of the containment tree in which it is 
> located, and any DataObjects referenced but not contained in 
> this tree must also be included among the DataGraph?s 
> orphans, so that the transitive closure is obtained.  
> References to orphaned DataObjects follow the normal rules of 
> XML serialization.  The serialization of a DataGraph never 
> throws an exception because the graph is not closed.
> ____________________
> The XSD at the end of the chapter would also need to be modified: 
>   <xsd:complexType name="BaseDataGraphType" abstract="true"> 
>     <xsd:sequence> 
>       <xsd:element name="models" type="sdo:ModelsType" 
> minOccurs="0"/> 
>       <xsd:element name="xsd" type="sdo:XSDType" minOccurs="0"/> 
>       <xsd:element name="changeSummary" 
>                    type="sdo:ChangeSummaryType" minOccurs="0"/> 
>       <xsd:element name=?orphans? 
>                    Type=?xsd:anyType? minOccurs=?0? 
> maxOccurs=?unbounded?/> 
>     </xsd:sequence> 
>     <xsd:anyAttribute namespace="##other" processContents="lax"/>
>   </xsd:complexType>
> ______________________
> Another small change will have to be made around line 3407, 
> but this is mainly editorial, and can be left to the editors.
> __________________________
> You might notice in the above text that not only is the 
> orphaned DataObject itself serialized, but also the complete 
> containment tree in which the object is located.  I think 
> this is necessary: first of all, because an object reachable 
> through getContainer() is non-the-less reachable, and 
> otherwise we don't really have transitive closure.  More 
> pragmatically, I think it will otherwise be very difficult to 
> create the URIs that reference the objects in any efficient 
> manner?suppose the reference to a leaf is found first, then 
> later a reference to the root.
> Of course, I'd agree to this proposal as a compromise, but I 
> do want to point out what we are losing by declaring this 
> functionality on DataGraph, rather than creating a new kind 
> of property, which DataGraph happens to have.  With this 
> proposal, DataGraph contains ChangeSummary, XSD, the business 
> object, and now orphans,  If we want to create a new type of 
> container, eg, with only orphans, we cannot do it.  The 
> functionality is specific to DataGraph.  It seems to me 
> allowing users to define such types is not a bad thing.  
> Effectively, that is the only difference between last week's 
> proposal and this one.
> Best Regards,
> Ron 
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