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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.
--
PITHY WORDS OF WISDOM
To err is human, but to really foul things up requires a computer.
This posting is provided "AS IS" with no warranties, and confers no
rights.
> -----Original Message-----
> From: Murali Mani [mailto:mani@CS.UCLA.EDU]
> Sent: Thursday, May 30, 2002 4:30 PM
> To: Eddie Robertsson
> Cc: Dare Obasanjo; xml-dev@lists.xml.org
> Subject: Re: [xml-dev] Question regarding PSVI..
>
>
>
> 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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