vdata_id	IN:	Vdata identifier returned by VSattach
	field_index	IN:	Index of the field
	attr_index	IN:	Index of the attribute
	attr_name	OUT:	Name of the attribute
	data_type	OUT:	Data type of the attribute
	count	OUT:	Attribute value count
	size	OUT:	Size of the attribute

	Purpose	Retrieves attribute information of a vdata or a vdata field.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	VSattrinfo gets information on the attribute attached to the vdata, vdata_id, or to the vdata field. Vdata field is specified by its index, field_index. Attribute is specified by its index, attr_index. The attribute name is returned into the parameter attr_name, the data type is returned into the parameter data_type, the number of values of the attribute is returned into the parameter count, and the size of the attribute is returned into the parameter size.
		The parameter field_index in VSattrinfo is the same as the parameter field_index in VSsetattr. It can be set to either an integer field index for the vdata field attribute, or _HDF_VDATA (or -1) to specify the vdata attribute.
		In C the values of the parameters attr_name, data_type, count and size can be set to NULL if the information returned by these parameters is not needed.

	FORTRAN	integer function vsfainf(vdata_id, field_index, attr_index, attr_name, data_type, count, size)
		integer vdata_id, field_index, attr_index
		character*(*) attr_name
		integer data_type, count, size