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The openejb-jar.xml Geronimo deployment plan for an EJB JAR is an XML document.

It is defined by the openejb-jar-2.0.xsd schema, which can be found in the schema/ subdirectory of the main Geronimo installation directory. The deployment plan for an EJB JAR may be:
Included in the EJB JAR, in which case it should be named META-INF/openejb-jar.xml Included in an EAR (but outside of the EJB JAR) and referenced by an alt-dd element of the EAR deployment plan Saved as a separate file and provided to the deploy tool when the EJB JAR module is deployed (though this doesn't work when the EJB JAR is in an EAR).

Created from scratch using a JSR-88 configuration tool, in which case the tool manages saving and loading the deployment plan and passing it to the server when the EJB JAR is deployed.The deployment plan should always use the OpenEJB namespace, and it typically requires elements from the Geronimo Naming, Geronimo Security, and Geronimo System namespaces. Additionally, it has a required attribute to identify its configuration name, and an optional attribute to select a parent configuration.

for read more information:
http://www.chariotsolutions.com/geronimo/ejb-overview.html