define type flag_type
	keyword external, nonnegatable
	keyword newmail, nonnegatable
	keyword marked, nonnegatable
	keyword replied, nonnegatable

define verb lstmail
	image	    "SYS$DISK:[]LSTMAIL"
	parameter   p1,		label=mailfile,value(type=$file)
	qualifier   before,	value(required,type=$datetime),
				nonnegatable
	qualifier   directory,	nonnegatable
	qualifier   flags,	value(type=flag_type,required,list),
				nonnegatable
	qualifier   folder,	value(required),
				nonnegatable
	qualifier   from,	value(required),
				nonnegatable
	qualifier   output,	value(type=$file,default="SYS$OUTPUT"),
				nonnegatable
        qualifier   since,	value(required,type=$datetime),
				nonnegatable
	qualifier   subject,	value(required),
				nonnegatable
	qualifier   to,		value(required),
				nonnegatable

	disallow    directory and (before or flags or from or since or subject or to)