Implicite Collections lead to wrong reference in plain XML text

If the implicit collection should be referenced, XStream cannot build a valid reference:

static class WithNamedList extends WithList {
private final String name;

public WithNamedList(final String name)

}

public void testReferenceByXPathWorksWithReferencedImplicitCollection() {
xstream.alias("strings", WithNamedList.class);
xstream.addImplicitCollection(WithNamedList.class, "things");
WithNamedList[] wls = new WithNamedList[]

;
wls[0].things.add("Hello");
wls[0].things.add("Daniel");
wls[1].things = wls[0].things;
String xml = xstream.toXml(wls);
System.out.println(xml);
}

<strings-array>
<strings>
<name>foo</name>
<string>Hello</string>
<string>Daniel</string>
</strings>
<strings>
<name>bar</name> reference="../strings"
</strings>
</strings-array>