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Re: Two quick questions regarding restriction in XML Schema

• To: Nada Reinprecht <Nada_Reinprecht@n...>
• Subject: Re: Two quick questions regarding restriction in XML Schema
• From: Murali Mani <mani@C...>
• Date: Thu, 16 May 2002 19:06:47 -0700 (PDT)
• Cc: <xml-dev@l...>
• In-reply-to: <OF2ACB3EDA.CA52ED51-ON4A256BBB.007E0C70@n...>

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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• Follow-Ups:
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    • From: Eddie Robertsson <erobertsson@a...>

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  • Re: Two quick questions regarding restriction in XML Schema
    • From: "Nada Reinprecht" <Nada_Reinprecht@n...>

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