union of two complex types - how would i do this?

[Joe Simone]

Hi all,

I have been scratching my head with this problem for a while now and I thought I would ask for some help.

Suppose I have a home-address tag specified as such in my XML:

<home-address>
<line1>123 smith street</line1>
<line2/>
<city>miami</city>
<state>FL</state>
<zip>33489</zip>
<country>USA</country>
</home-address>

and suppose that somewhere else I want to default to this address for other address specifications such as ...

<credit-card-billing-address use-default="true"/>
or
<ship-to-address use-default="true"/>

or to specify a override address ...

<credit-card-billing-address>
<line1>123 smith street</line1>
<line2/>
<city>miami</city>
<state>FL</state>
<zip>33489</zip>
<country>USA</country>
</credit-card-billing-address>

how do i write the XML schema such that both content models work. I would hate to have to re-specifiy the same address for both <credit-card-billing-address> and <ship-to-address> if they exactly the same as the <home-address>.

Here is what I have so far:

<xsd:complexType name="requiredAddressType">
<xsd:sequence>
                <xsd:element name="line1" type="nameType"/> 
<xsd:element name="line2" type="optionalNameType"/> 
<xsd:element name="city" type="nameType"/> 
<xsd:element name="state" type="nameType"/> 
<xsd:element name="zip" type="nameType"/> 
<xsd:element name="country" type="nameType"/> 
</xsd:sequence>
</xsd:complexType>
    
<xsd:complexType name="alternateAddressType">
 <xsd:attribute name="use-default"  type="booleanType"    fixed="true"  /> 
</xsd:complexType>    
 
  

So I would like either the content model to be either requiredAddressType which fleshes out the address or alternateAddressType which defaults to an already specified requiredAddress.

Many thanks,
Joe

[Choon-Chern Lim]

Yes... try this:

  
// your code
<xsd:complexType name="requiredAddressType"><xsd:sequence>                <xsd:element name="line1" type="nameType"/> <xsd:element name="line2" type="optionalNameType"/> <xsd:element name="city" type="nameType"/> <xsd:element name="state" type="nameType"/> <xsd:element name="zip" type="nameType"/> <xsd:element name="country" type="nameType"/> </xsd:sequence></xsd:complexType>
 
<xs:element name="home">
 <xs:simpleType>
   <xs:element ref="requiredAddressType"/>
 </xs:simpleType>
</xs:element>
 
<xs:element name="creditcard">
 <xs:simpleType>
   <xs:element ref="requiredAddressType"/>
 </xs:simpleType>
</xs:element>