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Hi Murali and Dare,
If you want to use both types Book and Book1 which is derived from Book
than you should use an xsi:type in your instance documents.
In some instances, your book will become Book
<book xsi:type="Book">
< ....
while in another instance documents your book will be Book1
<book xsi:type="Book1"
This allows you to change the content of the same element as required in
your instance documents. However, if you always want only to use Book1 type
for your book element, than you can specify that in the schema:
<xsd:element name="book" type="Book1">
The book will than always have the type of Book1 in your instance
documents:
<book>
<title>XYZ</title>
<author>ABC</author>
<author>DEF</author>
</book>
Cheers,
</nada>
"Dare
Obasanjo" To: "Murali Mani" <mani@CS.UCLA.EDU>, "Nada
<dareo@micros Reinprecht" <Nada_Reinprecht@nemmco.com.au>
oft.com> cc: <xml-dev@lists.xml.org>
Subject: RE: [xml-dev] Two quick questions regarding
23/05/02 restriction in XML Schema
04:00
It is the former. I think he was stating that you could have done
<element name="book" type="Book1">
in the schema instead of using xsi:type in the instance document.
--
PITHY WORDS OF WISDOM
In a fight between you and the world-bet on the world.
This posting is provided "AS IS" with no warranties, and confers no
rights.
You assume all risk for your use. (c) 2002 Microsoft Corporation. All
rights reserved.
> -----Original Message-----
> From: Murali Mani [mailto:mani@CS.UCLA.EDU]
> Sent: Thursday, May 16, 2002 7:07 PM
> To: Nada Reinprecht
> Cc: xml-dev@lists.xml.org
> Subject: Re: [xml-dev] Two quick questions regarding
> restriction in XML Schema
>
>
>
> Can I ask an example,
>
> suppose we defined
>
> type Book -> (Title, Author*)
> type Book1 restricts Book -> (Title, Author, Author)
>
> (in other words, Book1 is for Books with exactly two Authors)
>
> Now suppose we declare an element as
>
> <element book type="Book">
>
> and in the document however we want to use type Book1, how do
> we say that?
>
> Do we say
> <book>
> <title>XYZ</title>
> <author>ABC</author>
> <author>DEF</author>
> </book>
>
> or do we say
> <book xsi:type="Book1">
> <title>XYZ</title>
> <author>ABC</author>
> <author>DEF</author>
> </book>
>
> I think it should be the latter? But Nada, I think you say it
> is the former?
>
> thanks and regards - murali.
>
> On Fri, 17 May 2002, Nada Reinprecht wrote:
>
> >
> > Muralli,
> >
> > a) You do not need to use xsi:type in the document if you
> derive the
> > type by restriction. In the schema you can simply associate the
> > derived type with an element.
> >
> > However, if you want to implement alternative contents for the same
> > element, than you use the xsi:type which allows you to specify
> > desirable content in each document.
> >
> > Cheers,
> >
> > </nada>
> >
> > I think these are related.. Can someone tell me --
> >
> > a) If we derive types by restriction, do we have to use xsi:type in
> > the document? Is it true if I say that the document will be valid
> > irrespective of whether we use xsi:type or not .. We use
> xsi:type to
> > know the "precise" type??
> >
> > b) Is there any point in using block for restriction
> >
> > thanks and regards - murali.
> >
> >
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