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   RE: [xml-dev] Two quick questions regarding restriction in XML Schema

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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. 

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> -----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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