Seems that xa-data-source add command does not work correctly.

Command
xa-data-source add --jndi-name=java:jboss/datasources/TestXADS --driver-name=h2 --pool-name=TestXADS
finishes OK, and xa-data-source is registered in model. However, server fails to restart since non-xa datasource is added to standalone.cfg instead of xa:

<datasource jndi-name="java:jboss/datasources/TestXADS" pool-name="TestXADS">
<driver>
h2
</driver>
</datasource>

Steps to reproduce:
1) start standalone server
1) CLI: xa-data-source add --jndi-name=java:jboss/datasources/TestXADS --driver-name=h2 --pool-name=TestXADS
2) stop server
3) start server

Server fails with:
16:13:03,175 ERROR [org.jboss.as.controller] Operation ("add") failed - address: ([
("subsystem" => "datasources"),
("data-source" => "java:jboss/datasources/TestXADS")
]) - failure description: "JBAS014746: connection-url may not be null"