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RE: Question regarding PSVI..

• To: Dare Obasanjo <dareo@m...>
• Subject: RE: Question regarding PSVI..
• From: Murali Mani <mani@C...>
• Date: Sun, 2 Jun 2002 14:45:07 -0700 (PDT)
• Cc: Eddie Robertsson <erobertsson@a...>, <xml-dev@l...>
• In-reply-to: <Pine.SOL.4.33.0205301653590.12689-100000@p...>

actually, can someone comment on this? I am quite interested in knowing
your opinions, as to whether this was unexpected, but what we have to live
with..??

thanks and regards - murali.

> You say that "any XML type system (even those based on tree expressions)
> will have problems with having to alter the type of an element if some of
> its content is modified."
>
> I agree -- I think that one of the unspecified goals of XML Schema is that
> "the type of an element will change only if its content is modified"
>
> that is what is being violated, right? we have not changed the content of
> <zip>90024</zip> in any way, but the type assignment has to be changed.
>
> I think the above is very subtle, and i am not sure if I am making sense.
>
> I think we can definitely handle this, but still..
>
> cheers and regards - murali.
>
> On Thu, 30 May 2002, Dare Obasanjo wrote:
>
> > A.) I'm don't think this was one of the design goals of W3C XML Schema.
> >
> > B.) I am not sure the W3C XML Schema Working Group specifically
> > considered editting/modification scenarios when designing W3C XML
> > Schema. But even if they had, the fact of the matter is that almost any
> > XML type system (even those based on tree expressions) will have
> > problems with having to alter the type of an element if some of its
> > content is modified.
> >
> > > -----Original Message-----
> > > From: Murali Mani [mailto:mani@C...]
> > >
> > > isn't one of the goals of XML Schema to try to avoid this --
> > > that is -- once an element is assigned a type, try not to
> > > change the type assignment for it???
> > >
> > > so will this be considered as a separate case by XML editors??
> > >
> > > thanks and regards - murali.
> > >
> > > On Fri, 31 May 2002, Eddie Robertsson wrote:
> > >
> > > > Hi,
> > > >
> > > > > regarding updates -- I had a question how updates work with
> > > > > wildcards.
> > > > >
> > > > > I presume the following schema is correct..
> > > > >
> > > > > <xs:element name="billTo">
> > > > >   <xs:complexType>
> > > > >     <xs:sequence>
> > > > >       <xs:element name="name" type="xs:string"/>
> > > > >       <xs:element name="address" type="xs:string"/>
> > > > >       <xs:element name="zip" type="xs:integer"/>
> > > > >       <!-- extension. one can put anything here -->
> > > > >       <xs:any namespace="#all" processContents="skip" />
> > > > >     </xs:sequence>
> > > > >   </xs:complexType>
> > > > > </xs:element>
> > > > >
> > > > > now, consider the tree (impractical, but still..)
> > > > >
> > > > > <billTo>
> > > > >    <name>ABC</name>
> > > > >    <address>California</address>
> > > > >    <zip>90095</zip>
> > > > >    <zip>90024</zip>
> > > > > </billTo>
> > > > >
> > > > > Now consider an update (delete the first zip element) --
> > > > >
> > > > > <billTo>
> > > > >    <name>ABC</name>
> > > > >    <address>California</address>
> > > > >    <zip>90024</zip>
> > > > > </billTo>
> > > > >
> > > > > Now, I hope both the documents are valid w.r.to the schema?? --
> > > > > also, will the type assignment for <zip>90024</zip> change during
> > > > > the update??
> > > >
> > > > Yes. In the first instance <zip>90024</zip> will be matched by the
> > > > wildcard and therefore will have the type xs:anyType (I
> > > think). In the
> > > > second instance <zip>90024</zip> will be matched by the zip element
> > > > declaration and hence have the type xs:integer.
> > > >
> > > > Cheers,
> > > > /Eddie
> > > >
> > > > >
> > > > > cheers and regards - murali.
> > > > >
> > > > > On Wed, 29 May 2002, Dare Obasanjo wrote:
> > > > >
> > > > > > > Anyways, my question is -- where will the type names
> > > and element
> > > > > > > declarations associated with an element information
> > > item in PSVI
> > > > > > > be used?
> > > > > >
> > > > > > I've seen user scenarios where both are needed.
> > > > > >
> > > > > > 1.) The type names for element declarations are useful for type
> > > > > > based queries like those that will exist in Xpath 2.0
> > > and XQuery.
> > > > > >
> > > > > >  EXAMPLE: /myco:company-roster/myco:employee[. instance
> > > of element
> > > > > > of type myco:managerType]
> > > > > >
> > > > > > where myco:managerType is a complexType defined in the schema.
> > > > > >
> > > > > > 2.) Currently MSXML ships with the ability to obtain the Schema
> > > > > > Object Model (SOM) object that represents an element or
> > > attribute
> > > > > > declaration from a DOM instance. Our users love it and we are
> > > > > > inundiated with requests to provide similar
> > > functionality for the
> > > > > > .NET frameworks version of the DOM. One user scenario involved
> > > > > > creating a schema-aware XML text editor and using the element
> > > > > > decls for the particular element being edited to
> > > determine whether
> > > > > > the edits were valid or not which was way more performant than
> > > > > > validating on each edit.
> > > > >
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> >
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