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From Simon Fell <s...@zaks.demon.co.uk>
Subject Re: complexType extending a simpleType
Date Thu, 21 Feb 2002 21:25:31 GMT
FWIW, I ran into this doing the Group D doc/literal interop tests for
pocketSOAP, and took exactly the same approach.

Cheers
Simon

On Thu, 21 Feb 2002 15:12:03 -0600, in soap you wrote:

>According to XML Schema Primer 0 Chapter 2.5.1, a complexType can be
>derived from a simple type to add attribute information.
>
>
>Lets say you had the following schema:
>
><complexType name="purchaseItem">
>     <complexContent>
>          <sequence>
>              <element name="itemName" type="xsd:string" />
>              <element name="price" type="xsd:string" />
>          </sequence>
>     </complexContent>
></complexType>
>
>The above could be sent over the wire as:
>
><purchaseItem>
>  <itemName>
>    Widget
>  </item>
>  <price>
>   1.00
>  </price>
><purchaseItem>
>
>And the above would be modeled as a java bean named PurchaseItem with two
>String properties.
>
>
>Now let's say you extend this for an international market, thus the price
>needs to know the
>currency.  Since it is closely tied to the price, you want to represent
>currency as an
>attribute on price.   Here's how to represent this in xml schema.
>
><complexType name="internationalPrice">
>    <complexContent>
>        <simpleContent>
>            <extension base="xsd:string"/>
>                <attribute name="currency" type="xsd:string">
>            </extension>
>        </simpleContent>
>    <complexContent>
></complexType>
>
><complexType name="purchaseItem">
>     <complexContent>
>          <sequence>
>              <element name="itemName" type="xsd:string" />
>              <element name="price" type="tns:internationalPrice" />
>          </sequence>
>     </complexContent>
></complexType>
>
>So this means that price is an element whose value is a string and has a
>currency attribute.
>
>Here is an example over the wire:
>
><purchaseItem>
>  <itemName>
>    Widget
>  </item>
>  <price currency="USDollars">
>   1.00
>  </price>
><purchaseItem>
>
>
>We don't support extension of simpleTypes yet.  When we do, we need
>to generate a PurchaseItem bean (as before) and a InternationalPrice bean.
>
>However, note that the InternationalPrice has a "raw" value that is
>serialized
>directly...not within an element and not as an attribute value.  The
>serializer and deserializer need to know about this raw value, and the bean
>requires
>a special property name to get to the raw value.  (I propose getValue and
>setValue
>accessors, which match what we do with enumeration classes...our other kind
>of simpleType).
>
>So both emitters, bean serializer, and bean deserializer will need to have
>extra code to support this feature.  (Note that this is an optional JAX-RPC
>feature).
>
>
>Comments?
>
>
>
>
>
>
>Rich Scheuerle
>XML & Web Services Development
>512-838-5115  (IBM TL 678-5115)


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