The H5S_GET_SELECT_NPOINTS function determines the number of elements in a dataspace selection.
            Syntax
            Result = H5S_GET_SELECT_NPOINTS(Dataspace_id)
            Return Value
            Returns the number of elements.
            Arguments
            Dataspace_id
            An integer representing the dataspace identifier to be queried.
            Keywords
            None
            Version History
            
            See Also
            H5S_GET_SELECT_BOUNDS, H5S_GET_SELECT_ELEM_NPOINTS, H5S_GET_SELECT_HYPER_NBLOCKS, H5S_GET_SIMPLE_EXTENT_NPOINTS