sds_id	IN:	Data set identifier returned by SDcreate or SDselect
	label	OUT:	Label (predefined attribute)
	unit	OUT:	Unit (predefined attribute)
	format	OUT:	Format (predefined attribute)
	coordsys	OUT:	Coordinate system (predefined attribute)
	length	IN:	Maximum length of the above predefined attributes

	Purpose	Retrieves the predefined attributes of a data set.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	SDgetdatastrs retrieves the predefined attributes for the data set specified by the parameter sds_id. The predefined attributes are label, unit, format, and coordinate system. They are then stored in the parameters label, unit, format, and coordsys, respectively. Refer to Section 3.10 of the HDF User's Guide for more information on predefined attributes.
		If a particular data string is not stored, the first character of the corresponding SDgetdatastrs parameter is '\0' in C. In FORTRAN, the parameter contains an empty string. Each string buffer must include the space to hold the null termination character. In C, if a user does not want a string back, NULL can be passed in for that string. Data strings are set by the SDsetdatastrs routine.

	FORTRAN	integer function sfgdtstr(sds_id, label, unit, format, coordsys, length)
		integer sds_id, length
		character*(*) label, unit, format, coordsys