[jboss-as7-dev] JBoss modules definition for Envers

Hi there, I am looking at the org.hibernate modules definition in AS7: - <module xmlns="urn:jboss:module:1.0" name="org.hibernate"> ... - <dependencies> ... <module name="org.hibernate.envers" services="import" optional="true" /> </dependencies> </module> Then at envers: - <module xmlns="urn:jboss:module:1.0" name="org.hibernate.envers"> ... - <dependencies> <module name="org.hibernate" /> ... </dependencies> </module> Are cyclical dependencies allowed? Also, what's the service="import" clause really about? What's a service in this context? From the doc: https://docs.jboss.org/author/display/MODULES/Module+descriptors: Specify whether this dependency's services* are imported and/or exported. Possible values are "none", "import", or "export"; defaults to "none". Thanks in advance /D