Write local options followed by the name of a program to run and its argument string after the label where it is declared. This defines the primary streams for the stage. The secondary and subsequent streams for a stage with a label are defined when you reference the label later in the pipeline spec- ification. A label declaration or reference may specify a stream identifier. Write a period followed by up to four characters between the label name and the ending colon.
Case is respected in stream identifiers.
The scope of a stream identifier is the particular stage that the label refers to. The period ending the label is optional when the stream identifier is not speci- fied. To circumvent the REXX limitation, assign parts of the pipeline to variables when a pipeline specification is longer than 500 characters. This is likely to lead to strange diagnostics when the pipeline specification is truncated.