Embedded property should be highligted on Open Mapping action.

This work for core hbm.xml mapping(composite-id), but because of a different syntax doesn't work for orm.xml mapping (embedded-id and embedded).

See test result for MappingTestsJpa JUnit and jpa.springframework.samples.petclinic package:
Highlighted region for property id is empty. (package jpa.springframework.samples.petclinic)

The property is a property of class TestId. Would be good to improve the message also.