JAXB - Binding element to Set instead of List

Question

Is there a way to make JAXB generate the Collection Set instead of List for an defined element?

For example generating a Set of books for this xsd:

<xs:element name="Collection">
<xs:complexType>
  <xs:sequence>
    <xs:element name ="books">
       <xs:complexType>
          <xs:sequence>
            <xs:element name="book" type="bookType" minOccurs="1" maxOccurs="unbounded"/>
          </xs:sequence>
       </xs:complexType>
    </xs:element>
  </xs:sequence>

When using the following bindings.xml

<jxb:bindings schemaLocation="schema.xsd">
    <jxb:bindings node="//xs:element[@name='Shop']/xs:complexType/xs:sequence/xs:element[@name='books']">
        <jxb:property collectionType="java.util.HashSet" />
    </jxb:bindings>
</jxb:bindings>

A List of books with a concret HashSet implementation is generated:

List<Book> books = new HashSet<Book>();

Answer 1

I don't think it can be done with a custom binding, because according to the guide on Customizing JAXB Bindings:

collectionType defines the customization value propertyCollectionType, which is the collection type for the property. propertyCollectionType if specified, can be either indexed or any fully-qualified class name that implements java.util.List.

However, it might be possible to do this if you wrote your own xjc plugin. Take a look at the following article to see how: Writing a plug-in for the JAXB RI is really easy