question about public_dependency view and ideptree?

[ryan_oracle]

This comes from $ORACLE_HOME/rdbms/admin/utldtree.sql

I expected to see a dependency here, but did not. Any idea? Im testing because I need 
to use these views to write some code. 

CREATE OR REPLACE PACKAGE X IS
  PROCEDURE Y;
END;

CREATE OR REPLACE PACKAGE BY X IS
  PROCEDURE Y IS
     BEGIN
       NULL;
     END Y;
END X;

CREATE OR REPLACE PACKAGE XX IS
    PROCEDURE YY;
END;

CREATE OR REPLACE PACKAGE BODY XX IS
   PROCEDURE YY IS
      BEGIN 
        X.Y; -- not the dependency
      END YY;
END XX;

I then execute procedure 
DEPTREE_FILL('PACKAGE BODY','USER','XX); from utldtree.sql, I then query 
deptree_temptab and there are no dependencies. What am I missing?

 OBJECT_ID REFERENCED_OBJECT_ID NEST_LEVEL       SEQ#
---------- -------------------- ---------- ----------
    205517                    0          0          0


Im lost here.... the procedure doesnt have alot of documentation. Should 
REFERENCE_OBJECT_ID be populated with the object_id of package X? 

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