These functions come from the OGR C API's OGR_FD_*
namespace.
val get_field_count : t ‑> int
get_field_count t
returns the number of fields associated with the
feature definition t
.
val get_field_defn : t ‑> int ‑> Field.Defn.t
get_field_defn t i
returns the i
th Field.Defn.t from t
.