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As for the question on using block for restriction which I assume means
using the block attribute on a complexType definition, the answer is
that you'd block restriction to prevent types derived by restriction
from replacing the content model of base types in an instance document.
This is also described in the XML Schema Primer in
http://www.w3.org/TR/xmlschema-0/#ref28
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> -----Original Message-----
> From: Nada Reinprecht [mailto:Nada_Reinprecht@nemmco.com.au]
> Sent: Thursday, May 16, 2002 4:04 PM
> To: Murali Mani
> Cc: xml-dev@lists.xml.org
> Subject: Re: [xml-dev] Two quick questions regarding
> restriction in XML Schema
>
>
>
> 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>
>
>
>
>
>
> Murali Mani
>
> <mani@CS.UCLA To:
> <xml-dev@lists.xml.org>
> .EDU> cc:
>
> Subject:
> [xml-dev] Two quick questions regarding
> 17/05/02 restriction in XML
> Schema
> 02:42
>
>
>
>
>
>
>
>
>
> 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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