vdata_id

IN:

Vdata identifier returned by VSattach

	Purpose	Determines whether a vdata is an attribute.
	Return value	Returns TRUE (or 1) if the vdata is an attribute, and FALSE (or 0) otherwise.
	Description	VSisattr determines whether the vdata identified by the parameter vdata_id is an attribute.
		As attributes are stored by the HDF library as vdatas, a means of testing whether or not a particular vdata is an attribute is needed, and is provided by this routine.

	FORTRAN	integer function vsfisat(vdata_id)
		integer vdata_id