You need to use the resource adapters from IronJacamar:
https://repository.jboss.org/nexus/content/groups/public/org/jboss/ironjacamar/
jdbc-local and jdbc-xa.
Also you need to use the new datasource XSD for defining a datasource:
http://anonsvn.jboss.org/repos/jbossas/projects/jboss-jca/trunk/common/src/main/resources/schema/datasources_1_0.xsd
You can check out the H2TestCase on how to deploy a datasource:
http://anonsvn.jboss.org/repos/jbossas/projects/jboss-jca/trunk/adapters/src/test/java/org/jboss/jca/adapters/jdbc/unit/H2TestCase.java
Having said that, start with a standard resource adapter (!= datasource) - you can create one using the code generator in docs/codegenerator - the key is to create a JCA 1.6 resource adapter with confidential and dynamic properties and which is bidirectional.