Config-property can't be added to the model for elements:
valid-connection-checker, stale-connection-checker, reauth-plugin,exception-sorter,recover-plugin.
So this fragment being parsed throws exception:
<reauth-plugin class-name="someClass2">
<config-property name="name">Property</config-property>
</reauth-plugin>

09:40:24,328 ERROR [org.jboss.as.controller.management-operation] Operation ("add") failed - address: ([
("subsystem" => "datasources"),
("data-source" => "complexDs_Pool")
]) - failure description: "JBAS014688: Wrong type for reauth-plugin-properties. Expected [EXPRESSION, STRING] but was OBJECT"