A class describing a GEO GDS entity
Objects can be created by calls of the form new("GDS", ...)
gpl:"GPL"dataTable:"GEODataTable"
containing the data table for the GDSheader:"list" containing the
metadata for the GDS; can be accessed via the Meta accessorClass "GEOData", directly.
No methods defined with class "GDS" in the signature, but methods applying to GEOData are also applicable here.