The DETACH FROM COMPOSITE command detaches an element from a
    composite. The element must be a controlled element that is not
    currently reserved. It also must be currently attached to the
    composite.

    Before you issue the DETACH FROM COMPOSITE command, you must
    have a context set and your composite reserved. The SHOW CONTEXT
    and SHOW RESERVATIONS commands indicate whether these conditions
    exist.

    You can use the DETACH FROM COMPOSITE command in conjunction with
    the DEFINE, RESERVE, REPLACE, and ATTACH TO COMPOSITE commands
    to link collections into collection hierarchies. See the DEFINE
    COLLECTION command for an example of a collection hierarchy.

    You can also use the DETACH FROM COMPOSITE and ATTACH TO
    COMPOSITE commands to move between lines of descent. See the
    Oracle CDD/Repository Architecture Manual for more information.