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RE: syntax, model

  • To: "Tyler Close" <tyler@w...>,"Rich Salz" <rsalz@d...>
  • Subject: RE: syntax, model
  • From: "Dare Obasanjo" <dareo@m...>
  • Date: Fri, 24 Oct 2003 11:12:59 -0700
  • Cc: <xml-dev@l...>
  • Thread-index: AcOaU5mMKVTTiiyZSwKTEPShWJmvIAABkiKw
  • Thread-topic: syntax, model

xs any xs anytype difference

> -----Original Message-----
> From: Tyler Close [mailto:tyler@w...] 
> Sent: Friday, October 24, 2003 9:57 AM
> To: Rich Salz
> Cc: xml-dev@l...
> Subject: Re:  syntax, model
> What's the difference between saying: "the data will fit this 
> form" versus "the possible values are of this form"?

Not much. However in the XML world people have come to make the
distinction between describing the structure of a document (location of
elements and attributes) and specifying the actual values in the
document (textual content of elements and attributes). 
> > When you see "xs:any" at the end of an "xs:complexType" 
> declaration, 
> > do you think "base class" or do you think ".*" (the regexp 
> pattern).  
> > It took me some time to get away from the first notion, and 
> it's still 
> > hard to come up with good words to explain it.
> >
> > What is the data model of this?
> >
> >     <xs:element name="Address">
> >        <xs:complexType>
> >            <xs:element name="Street"/>
> >            <xs:element name="Country"/>
> >            <xs:element name="PostalCode"/>
> >        </xs:complexType>
> >     </xs:element>
> We're not connecting on something here, because for me, that 
> XML snippet does describe a data model. It says an Address is 
> composed of a Street, Country and Postal Code. What else is 
> there for a data model to say about an Address?

Since the types of the Street, Country and PostalCode elements is
xs:anyType meaning they can have any content I'm assuming Rich means
there isn't enough information there to do much processing with.  

To err is human, to forgive is against department policy.

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