{}
{     The purpose of this request is to prepare a list of elements
{ that have changed since the previous BCU was generated.
{
{     The RAV$INSTALLATION_TABLE is used to generate a list of elements
{ to be compared.  The elements in the RAV$NEW_SYSTEM_CATALOG are compared
{ with the same elements from the PREVIOUS_SYSTEM_CATALOG (which defaults
{ to RAV$OLD_SYSTEM_CATALOG).
{
{     The method of comparing elements is taken from the COMPARE_FILE
{ scl command.  Most of the program interfaces called by COMPARE_FILE
{ are used here.
{
{     PREPARE_ELEMENT_LIST is a subcommand from the PACKAGE_CORRECTIONS
{ utility.  The variables RAV$NEW_SYSTEM_CATALOG, RAV$OLD_SYSTEM_CATALOG
{ and RAV$INSTALLATION_TABLE were created by the utility and are XREF'd
{ here.
{}
{        RAP$PREPARE_ELEMENT_LIST (PARAMETER_LIST, STATUS)
{}
{PARAMETER_LIST: (input) This parameter specifies a sequence that holds the
{        user entered parameter values.
{}
{STATUS: (output) This parameter specifies any resulting errors.
{}
