[castor-user] [XML] avoid wrapper elements (from location) for empty collections

[Cristiana Ion]

Hi all,

I want to marshal a Java object that has a collection property putting 
all the elements of the collection in one wrapper element, using the 
location attribute. The problem is that the wrapper element is still 
generated even if my collection is null or empty.
For example:
public class A {
   private List<B> bs;
}

public class B {
   private String name;
}

The mapping for the two classes is:

   <class cst:name="A">
       <map-to cst:xml="a"/>
       <field cst:name="bs" cst:type="B" cst:collection="collection">
           <bind-xml location="bs" auto-naming="deriveByClass"/>
       </field>
   </class>
   <class cst:name="B">
       <map-to cst:xml="b"/>
       <field cst:name="name" cst:type="java.lang.String">
           <bind-xml name="name" node="element"/>
       </field>
   </class>

And the marshalling output for an A class with no B elements is:
<a>
   <bs/>
</a>

I've tried using the nillable="true" attribute for the 'bs' field of my 
A class, but this didn't solve the problem.
I've also looked through the mail archive for anything similar but 
couldn't find a solution to my problem.
BTW I'm using the 0.9.7 release but if needed i can switch to 0.9.9 :)

Thanks in advance.
Cristiana.

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