Parent Topic: Vectors (VEC)

The following metadata items have special meaning for vector layers:

LAYER_TYPE: Can be "UNKNOWN" (implicit default), "WHOLE_POLYGONS" (all shapes are closed polygons representing a region, possibly including internal rings, "TOPO_ARGS" (topological arcs layer), "TOPO_NODES" (topological nodes layer, "TOPO_AREAS" (topological areas layer), "POINTS" (all shapes are one vertex points), ARCS (all shapes are multi-point arcs) or "TABLE" (no vertices, this layer is pure attribute information). See the Topology definition for more details on the requirements of topological layers.

ARC_REF, NODE_REF and AREA_REF: A set of topological layers are grouped with each other with these metadata entries. A detailed explanation of the layer reference naming convention can be found in the general metadata topic.

XXX_FieldID: This metadata identifies what attribute field on this layer should be used for a particular renamable system attribute role. See the System Attributes topic for a list of system attributes, and their roles. The value can be the name of a field or it's zero based field number. For example a REPCode_FieldID value of Attribute would indicate that the field named Attribute should be used as the REPCode for this layer.

LONG_FIELD_NAME_n: Long name for the indicated field. The long name is preferable for user display to the builtin short field name.