/PLACEHOLDER_DELIMITERS=(delimiter-specification[, . . . ])

    Specifies the starting and ending strings that delimit
    placeholders. Placeholders can specify single constructs or lists
    of constructs. The delimiters for each type of placeholder are
    specified as a pair of quoted strings separated by commas and
    enclosed in parentheses.

    The format of a delimiter specification is as follows:

    keyword=(starting-string,ending-string)

    Possible keywords are REQUIRED, REQUIRED_LIST, OPTIONAL, OPTIONAL_
    LIST, or PSEUDOCODE. If you do not use the PSEUDOCODE keyword, the
    default is NOPSEUDOCODE. The maximum length of these strings is
    seven characters.

    The following is an example of a complete set of placeholder
    delimiter specifications:

      /PLACEHOLDER_DELIMITERS = ( -
       REQUIRED =("{<",">}"), -
       REQUIRED_LIST=("{<",">}..."), -
       OPTIONAL =("[<",">]"), -
       OPTIONAL_LIST=("[<",">]..."), -
       PSEUDOCODE=("«" , "»"))

    If any of the five keywords are not specified with the
    /PLACEHOLDER_DELIMITERS qualifier, LSE applies the following
    defaults:

      /PLACEHOLDER_DELIMITERS = ( -
       REQUIRED =("{","}"), -
       REQUIRED_LIST=("{","}..."), -
       OPTIONAL =("[","]"), -
       OPTIONAL_LIST=("[","]..."), -
       NOPSEUDOCODE)