SAML2 xml structured attribute values

I’ve been working with Apache CXF and WSS4J to implement a SecurityTokenService.

Using a “CustomClaimsHandler” implementing "org.apache.cxf.sts.claims.ClaimsHandler" I can create a SAML token containing this kind of attributes :

<saml2:Attribute Name="http://ift.tt/1BUgY80" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified">
               <saml2:AttributeValue xsi:type="xs:string">admin</saml2:AttributeValue>
</saml2:Attribute>

The thing is I am now trying to create an attribute with some XML content. For exemple :

<saml2:Attribute Name="http://my/xml/content">
               <saml2:AttributeValue xsi:type="???">
        <somthing>
<somthingElse>text</somthingElse>
        </somthing>
</saml2:AttributeValue>
</saml2:Attribute>

I’ve looked at making a custom implementation of a “ClaimsAttributeStatementProvider” (org.apache.cxf.sts.claims) but I seem to have to use the “AttributeBean” class of WSS4J. But this class doesn’t seem to let me change the type.

Does someone now how to deal with this issue ?

Regards