Module feature 

The common feature model used by every format driver.

The data model follows OGC Simple Features:

• A Layer is a named collection of Features sharing a Schema.
• A Feature has an optional Geometry and a vector of FieldValues.
• A Schema is an ordered list of FieldDefs.

All format drivers convert their native records to/from these types, so cross-format conversion is simply: read(src) → Layer → write(dst).

Structs

Crs

Coordinate reference system metadata attached to a Layer.

Feature

A single geographic feature: optional geometry + attribute values.

FieldDef

Metadata for a single attribute field.

Layer

A named collection of features sharing a geometry type and attribute schema.

Schema

Ordered list of field definitions with fast name→index lookup.

Enums

FieldType

Storage type of one attribute field.

FieldValue

A typed attribute value.