Re: [xml-dev] Constraints for nested elements; key and keyref

You don't need the extra element, just some new constraints (XSV is
happy with this, and complains correctly if you change e.g. the last
child to have childid 4714):

Hope this helps,

ht

---- XML-Instance ----

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="Multikeys_v2.xsd">
	<parent parentid="1">
		<child parentid="1" childid="4711"/>
		<child parentid="1" childid="4712"/>
		<child parentid="1" childid="4713"/>
	</parent>
	<parent parentid="2">
		<child parentid="2" childid="4711"/>
		<child parentid="2" childid="4715"/>
	</parent>
	<refer>
		<parentRef parentRefId="1">
			<childRef  parentRefId="1" childRefId="4711"/>
		</parentRef>
		<parentRef parentRefId="2">
			<childRef  parentRefId="2" childRefId="4715"/>
		</parentRef>
	</refer>
</root>

----- Multikeys_v2.xsd ------
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
 <xs:element name="root">
  <xs:complexType>
   <xs:sequence>
    <xs:element name="parent" minOccurs="0" maxOccurs="unbounded">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="child" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
         <xs:attribute name="childid" type="xs:int" use="required"/>
         <xs:attribute name="parentid" type="xs:int" use="required"/>
        </xs:complexType>
       </xs:element>
      </xs:sequence>
      <xs:attribute name="parentid" type="xs:int" use="required"/>
     </xs:complexType>
     <xs:key name="childKey">
      <xs:selector xpath="./child"/>
      <xs:field xpath="@childid"/>
     </xs:key>
     <xs:key name="localParent">
      <xs:selector xpath="."/>
      <xs:field xpath="@parentid"/>
     </xs:key>
     <xs:keyref name="childParent" refer="localParent">
      <xs:selector xpath="./child"/>
      <xs:field xpath="@parentid"/>
     </xs:keyref>
    </xs:element>
    <xs:element name="refer">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="parentRef" maxOccurs="unbounded">
        <xs:complexType>
         <xs:sequence>
          <xs:element name="childRef" maxOccurs="unbounded">
           <xs:complexType>
            <xs:attribute name="childRefId" type="xs:int" use="required"/>
            <xs:attribute name="parentRefId" type="xs:int" use="required"/>
           </xs:complexType>
          </xs:element>
         </xs:sequence>
         <xs:attribute name="parentRefId" type="xs:int" use="required"/>
        </xs:complexType>
       </xs:element>
      </xs:sequence>
     </xs:complexType>
    </xs:element>
   </xs:sequence>
  </xs:complexType>
  <xs:key name="parentKey">
   <xs:selector xpath="./parent"/>
   <xs:field xpath="@parentid"/>
  </xs:key>
  <xs:key name="fullChildKey">
   <xs:selector xpath="parent/child"/>
   <xs:field xpath="@childid"/>
   <xs:field xpath="@parentid"/>
  </xs:key>
  <xs:keyref name="parentRef" refer="parentKey">
   <xs:selector xpath="refer/parentRef"/>
   <xs:field xpath="@parentRefId"/>
  </xs:keyref>
  <xs:keyref name="fullChildRef" refer="fullChildKey">
   <xs:selector xpath="refer/parentRef/childRef"/>
   <xs:field xpath="@childRefId"/>
   <xs:field xpath="@parentRefId"/>
  </xs:keyref>
 </xs:element>
</xs:schema>
-- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: 
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]