[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: References in XSD/XML
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@n...> To: xml-dev@l... cc: 08/12/2003 12:13 Subject: 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 ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://lists.xml.org/ob/adm.pl> ------------------------------------------ This e-mail is confidential. If you are not the intended recipient, any use, disclosure or copying of this document is unauthorised and prohibited. If you have received this document in error, please delete the email and notify me by return email or by phoning the NEMMCO Helpdesk on 1300 300 295.
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