-# Input parameters
+# Input Parameter Types
+
+This page describes in more detail some of the input parameter types used
+in the query functions of the API object.
## Place identification
+The [details](NominatimAPI.md#nominatim.api.core.NominatimAPI.details) and
+[lookup](NominatimAPI.md#nominatim.api.core.NominatimAPI.lookup) functions
+require references to places in the database. Below the possible
+types for place identification are listed. All types are dataclasses.
+
+### PlaceID
+
::: nominatim.api.PlaceID
options:
heading_level: 6
+### OsmID
+
::: nominatim.api.OsmID
options:
heading_level: 6
-## Geometries
+## Geometry types
::: nominatim.api.GeometryFormat
options:
heading_level: 6
+ members_order: source
+
+## Geometry input
+
+### Point
::: nominatim.api.Point
options:
heading_level: 6
+ show_signature_annotations: True
+
+### Bbox
::: nominatim.api.Bbox
options:
heading_level: 6
+ show_signature_annotations: True
+ members_order: source
+ group_by_category: False
## Layers
+Layers allow to restrict the search result to thematic groups. This is
+orthogonal to restriction by address ranks, which groups places by their
+geographic extent.
+
+
::: nominatim.api.DataLayer
options:
heading_level: 6
+ members_order: source