The subsystem test framework's SchemaValidator class requires some expression resolution stuff from jboss-metadata-common, which means we have a test-only dep on that lib in core. Look into using something else for this, e.g. ExpressionResolver.SIMPLE_LENIENT. All it is doing is replacing expressions with defaults with the default value.

SchemaValidator is less useful than we originally envisioned anyway, as a lot of the subsystem templates cannot be valid as they include substitution data.