If you use the PARAMETER COLONS clause, all parameter names
    must begin with a colon (:).  This is valid in context files for
    module language only. This rule applies to both declarations and
    references of module language procedure parameters. If you do not
    use this clause, no parameter name can begin with a colon.

    The current default behavior is no colons are used. However,
    this default is deprecated syntax. In the future, required colons
    will be the default because it allows processing of ANSI/ISO SQL
    standard modules.

    Use the PARAMETER COLONS clause, rather than the SQLOPTIONS
    deprecated in a future release.