EJB 3 persistence spec says in 6.2.1.6, 2nd paragraph about <jar-file>

"Such JAR files are specified relative to the root of the persistence unit (e.g.,utils/myUtils.jar)"

When I have a persistence.xml like this:

<persistence>
    <persistence-unit name="jon">
        <jta-data-source>java:/JONDS</jta-data-source>
        <jar-file>lib/on-enterprise-server-2.0-SNAPSHOT.jar</jar-file>
    </persistence-unit>
</persistence>

The PersistenceUnitDeployment gives
file:/jboss-4.0.5.CR1/bin/lib/on-enterprise-server-2.0-SNAPSHOT.jar]

but the root of the PersistenceUnit is
file:/jboss-4.0.5.CR1/server/jon/deploy/on.ear/on-enterprise-server-entity-ejb-2.0-SNAPSHOT.jar/

2006-10-04 18:00:43,537 DEBUG [org.jboss.ejb3.entity.PersistenceUnitDeployment] Found persistence.xml file in EJB3 jar
2006-10-04 18:00:43,538 DEBUG [org.jboss.ejb3.entity.PersistenceUnitDeployment] adding JarFile URL: file:/jboss-4.0.5.CR1/bin/lib/on-enterprise-server-2.0-SNAPSHOT.jar
2006-10-04 18:00:43,586 INFO [org.hibernate.ejb.Version] Hibernate EntityManager 3.2.0.CR2
2006-10-04 18:00:43,625 INFO [org.hibernate.cfg.annotations.Version] Hibernate Annotations 3.2.0.CR2
2006-10-04 18:00:43,638 INFO [org.hibernate.cfg.Environment] Hibernate 3.2 cr4
2006-10-04 18:00:43,649 INFO [org.hibernate.cfg.Environment] hibernate.properties not found
2006-10-04 18:00:43,654 INFO [org.hibernate.cfg.Environment] Bytecode provider name : javassist
2006-10-04 18:00:43,666 INFO [org.hibernate.cfg.Environment] using JDK 1.4 java.sql.Timestamp handling
2006-10-04 18:00:43,906 DEBUG [org.hibernate.ejb.Ejb3Configuration] Processing PersistenceUnitInfo [
        name: jon
        persistence provider classname: org.hibernate.ejb.HibernatePersistence
        classloader: org.jboss.mx.loading.UnifiedClassLoader3@3b31a6{ url=file:/jboss-4.0.5.CR1/server/jon/deploy/on.ear/ ,addedOrder=43}
        Temporary classloader: null
        excludeUnlistedClasses: false
        JTA datasource: org.jboss.resource.adapter.jdbc.WrapperDataSource@c90acb
        Non JTA datasource: null
        Transaction type: JTA
        PU root URL: file:/jboss-4.0.5.CR1/server/jon/deploy/on.ear/on-enterprise-server-entity-ejb-2.0-SNAPSHOT.jar/
        Jar files URLs [
                file:/jboss-4.0.5.CR1/bin/lib/on-enterprise-server-2.0-SNAPSHOT.jar]
        Managed classes names []
        Mapping files names []
        Properties [