Hi Vladimir,
persistence-context-ref is included in ejb-jar_3_0.xsd by reference. It's actually defined within the
javaee_5.xsd. In Java EE, the programming model for the component environment is essentially
the same across the different component types (EJB, web tier, Application Client), so the
definition of the xml elements for the environment dependencies (ejb-ref, resource-ref,
persistence-context-ref, etc.) are defined within a common Java EE schema and then referred to
by the ejb-jar, web, and application-client component .xsds.
--ken
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