From: Richard Cote <rglcote_at_gmail.com>
Date: Fri, 13 Jun 2008 15:08:05 +0100

Hello all

I have the following schema snippet:

<xs:complexType name="ComponentListType">
   <xs:sequence minOccurs="3" maxOccurs="unbounded">
     <xs:choice>
       <xs:element name="source" type="dx:ComponentType" />
       <xs:element name="analyzer" type="dx:ComponentType" />
       <xs:element name="detector" type="dx:ComponentType" />
     </xs:choice>
   </xs:sequence>
   <xs:attribute name="count" type="xs:nonNegativeInteger" use="required" />
</xs:complexType>

And I also use external schema bindings to generate Java classes. Here
is a snippet of the bindings.xjb file:

     <jxb:bindings node="//xs:complexType[@name='ComponentListType']">
         <jxb:class name="ComponentList"/>
     </jxb:bindings>
     <jxb:bindings node="//xs:complexType[@name='ComponentType']">
         <jxb:class name="Component"/>
     </jxb:bindings>

When the code is generated, the ComponentList class looks like this:

public class ComponentList {

     @XmlElementRefs({
         @XmlElementRef(name = "analyzer", type = JAXBElement.class),
         @XmlElementRef(name = "source", type = JAXBElement.class),
         @XmlElementRef(name = "detector", type = JAXBElement.class)
     })
     protected List<JAXBElement<Component>> sourceOrAnalyzerOrDetector;
     @XmlAttribute(required = true)
     @XmlSchemaType(name = "nonNegativeInteger")
     protected BigInteger count;

  [cut for clarity]
}

While this works, it's ugly. I'm trying to get my schema annotated in
such a way that the class will look like:

     @XmlElementRefs({
         @XmlElementRef(name = "analyzer", type = Component.class),
         @XmlElementRef(name = "source", type = Component.class),
         @XmlElementRef(name = "detector", type = Component.class)
     })
     protected List<Component> components;

All the examples I've seen so far use inline schema annotations but, for
various reasons, I can't use those. I have been unable to find any
documentation on how to use external annotations to get the result I want.

I have tried to use the following external annotation:

     <jxb:bindings
node="//xs:complexType[@name='ComponentListType']//xs:sequence//xs:choice">
         <jxb:property name="components"/>
     </jxb:bindings>

But when I tried to compile the schema with xjc, I get this error:

parsing a schema...
[ERROR] compiler was unable to honor this property customization. It is
attached to a wrong place, or its inconsistent with other
bindings.
   line 103 of file:./src/main/resources/bindings.xjb

Any help would be most appreciated.

Cheers,
Rc

-- 
Richard Cote
Software Engineer - PRIDE Project Team (Sequence Database Group)
European Bioinformatics Institute
Wellcome Trust Genome Campus                 rcote_at_ebi.ac.uk
Hinxton, Cambridge CB10 1SD                  Phone: (+44) 1223 492610
United Kingdom