sds_id

IN:

Data set identifier returned by SDcreate or SDselect

	Purpose	Returns the reference number assigned to a data set.
	Return value	Returns the data set reference number if successful and FAIL (or -1) otherwise.
	Description	SDidtoref returns the reference number of the data set specified by the parameter sds_id. The reference number is assigned by the HDF library when the data set is created. The specified reference number can be used to add the data set to a vgroup as well as a means of using the HDF annotations interface to annotate the data set.

	FORTRAN	integer function sfid2ref(sds_id)
		integer sds_id