$session->deleteInstance( $object )
Deletes the specified object instance from the repository. Note that this does not clean up all the object interdependencies and links. When the Domain Manager has a MODEL based on ICIM, for a cleaner object deletion, you can use the remove() operation, if one exists for the object class in question. The section “invoke” on page 98 provides additional information.
$session->deleteInstance( "ACT_File::myFile" );