Deployment descriptors from a referenced installed library are ignored

This is more a question than a bug report. A Weld user run into this issue (see also WELD-1851) and we're not quite sure whether this is something that should work.

There are two separated applications: test-ejb-jar and test-war. test-ejb-jar contains persistence.xml descriptor. When test-war is referencing test-ejb-jar (either by means of jboss-deployment.xml, Dependencies manifest entry or by means of extension mechanism) the deployment of test-war fails, because a persistence unit is not found during injection.

Now the question is whether the "Library Support" only means access to classes and resources or classes, resources and descriptors. I believe it's the former but the EE spec is not clear.