Modification

A group of objects can be given by specifying some editing to apply to another already existing group of objects. For instance, if the string NEW_*B|_DS|_IM| was given in response to a request for a group expression, then the following steps occur:

• Each element in some existing group of objects (identified in the description of the parameter concerned) is substituted in turn for the ``*'' character.
• Any occurrences of the string ``_DS'' is replaced by the string ``_IM''.
• The string ``B'' is added to the end of the string.
• The string ``NEW_'' is added to the start of the string.

Thus if the existing group contained the strings FILE1_DS and FILE2_DS, the resulting group would be NEW_FILE1_IMB and NEW_FILE2_IMB. Note, this facility is only available if the parameter description identifies an existing group which will be used as the basis for the modified strings.