Re: [xml-dev] References in XSD/XML

["Nada Reinprecht" <Nada_Reinprecht@nemmco.com.au>]

Alain,

To enforce constraints between orders and assets and reference an asset in
an order, you may use key and keyref elements.

Here is an example taken from the
http://datypic.com/books/DefXMLSchema/chapter17.html

 <xsd:keyref name="prodNumKeyRef" refer="prodNumKey">
      <xsd:selector xpath="items/*"/>
      <xsd:field xpath="@number"/>
    </xsd:keyref>
    <xsd:key name="prodNumKey">
      <xsd:selector xpath=".//product"/>
      <xsd:field xpath="number"/>
    </xsd:key>

Cheers,

nada


                                                                                                                                 
                      Alain Tésio                                                                                                
                      <ate@nexfi.fr>           To:       xml-dev@lists.xml.org                                                   
                                               cc:                                                                               
                      08/12/2003 12:13         Subject:  [xml-dev] References in XSD/XML                                         
                      AM                                                                                                         
                                                                                                                                 
                                                                                                                                 




Hi, I'm having problems writing a schema with elements referencing each
other. I've written a large schema with several business objects defined
in complex types.

Let's say I have two complex types "asset" and "order" in the namespace
"test", "order" has an element with the type "test:asset"

Here is the .xsd file :

================= test.xsd
<?xml version="1.0" encoding="iso-8859-1"?>
<xs:schema targetNamespace="Test" xmlns:xs="
http://www.w3.org/2001/XMLSchema";
xmlns:test="Test" elementFormDefault="qualified"
attributeFormDefault="unqualified">
             <xs:complexType name="order">
                         <xs:sequence>
                                     <xs:element name="Reference"
type="xs:string"/>
                                     <xs:element name="Status"
type="xs:string"/>
                                     <xs:element name="Asset"
type="test:asset"/>
                         </xs:sequence>
                         <xs:attribute name="ID" type="xs:long"
use="required"/>
             </xs:complexType>
             <xs:complexType name="asset">
                         <xs:sequence>
                                     <xs:element name="ISINCode"
type="xs:string"/>
                                     <xs:element name="Designation"
type="xs:string"/>
                         </xs:sequence>
                         <xs:attribute name="ID" type="xs:long"
use="required"/>
             </xs:complexType>
             <xs:element name="testObjects">
                         <xs:complexType name="testEntity">
                                     <xs:choice>
                                                 <xs:element name="order"
type="test:order"/>
                                                 <xs:element name="asset"
type="test:asset"/>
                                     </xs:choice>
                         </xs:complexType>
             </xs:element>
</xs:schema>
=================

And here is a valid xml file for this schema:

================= test.xml
<?xml version="1.0" encoding="iso-8859-1"?>
<testObjects xmlns="Test"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="Test
C:\tmp\test.xsd">
             <order ID="951">
                         <Reference>ATE-030912113020</Reference>
                         <Status>Executed</Status>
                         <Asset ID="5709">
                                     <ISINCode>FR0000060899</ISINCode>
                                     <Designation>BACOU
DALLOZ</Designation>
                         </Asset>
             </order>
</testObjects>
=================


What I'd like is to define the second object "asset" outside the
object "order", and have a single line in "order" referencing it
with its id, I can have several objects with the same type in one
xml file.

I think I can do this with elements and ref to elements but the
number and types of elements in the xml file depends on the object.

Thanks for your time

Alain



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