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<properties>
  <!--http://openjpa.apache.org/faq.html-->
  <!-- does not create foreign keys, creates schema and deletes content of a database 
       (deleteTableContents - foreign keys are created twice???), use dropDB instead -->
  <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(foreignKeys=true,schemaAction='dropDB,add')"/>
  <!--Resolves the problem with foreign key integrity - joined entities are persisted sometimes in wrong order??? (verify it)-->
  <property name="openjpa.jdbc.SchemaFactory" value="native(foreignKeys=true)" />
  <!--Create foreign keys-->
  <property name="openjpa.jdbc.MappingDefaults" value="ForeignKeyDeleteAction=restrict, JoinForeignKeyDeleteAction=restrict"/>
  <property name="openjpa.Log" value="DefaultLevel=TRACE,SQL=TRACE" />
</properties>