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Re: Two quick questions regarding restriction in XML Schema

• To: Murali Mani <mani@C...>
• Subject: Re: Two quick questions regarding restriction in XML Schema
• From: Eddie Robertsson <erobertsson@a...>
• Date: Fri, 17 May 2002 12:37:05 +1000
• Cc: Nada Reinprecht <Nada_Reinprecht@n...>, xml-dev@l...
• References: <Pine.SOL.4.33.0205161902150.22396-100000@p...>

Hi,

> 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>

No, this will use the type "Book".

> or do we say
> <book xsi:type="Book1">
>     <title>XYZ</title>
>    <author>ABC</author>
>    <author>DEF</author>
> </book>

Yes, this will use the type "Book1" so if you do:

<book xsi:type="Book1">
    <title>XYZ</title>
   <author>ABC</author>
   <author>DEF</author>
   <author>EDF</author>
</book>

you will receive a validation error.

> I think it should be the latter?

Correct.

Cheers,
/Eddie

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