Question

I’m trying to create an element in a schema where its sub-types can appear in any order and as many times as necessary:

    <xs:element name='workflowNodes'>     <xs:complexType>         <xs:sequence minOccurs='0' maxPO>             <xs:element ref='nodeType1' />             <xs:element ref='nodeType2' />             <xs:element ref='nodeType3' />             <xs:element ref='nodeType4' />         </xs:sequence>     </xs:complexType> </xs:element> 

where the nodes nodeType(n) can be in any order and be repetitive as necessary.

Also, I tried :

But the compiler is not working complaining the nodeType2 is not valid when there is not nodeType1.

What am I missing here?

Thanks in advance.

Answer 1

You should be able to get your results by doing this:

<xs:element name='workflowNodes'>         <xs:complexType>                 <xs:choice minOccurs='0' maxOccurs='unbounded'>                         <xs:element ref='nodeType1' />                         <xs:element ref='nodeType2' />                         <xs:element ref='nodeType3' />                         <xs:element ref='nodeType4' />                 </xs:choice>         </xs:complexType> </xs:element> 

<xs:choice> gives you the option to pick one of the elements, and making the xs:choice appear many times allows you to pick each element as many times as you like.

Marc