# Module: ol/format/GMLBase

This documentation is for OpenLayers v10.9.0. The latest is v.

## ol/format/GMLBase

### Classes

GMLBase

### Type Definitions

#### Options{Object}

  ##### Properties:

  Name | Type | Description
  --- | --- | ---
  `featureNS` | Object.<string, string> | string | undefined | Feature namespace. If not defined will be derived from GML. If multiple feature types have been configured which come from different feature namespaces, this will be an object with the keys being the prefixes used in the entries of featureType array. The values of the object will be the feature namespaces themselves. So for instance there might be a featureType item `topp:states` in the `featureType` array and then there will be a key `topp` in the featureNS object with value `http://www.openplans.org/topp`.
  `featureType` | Array.<string> | string | undefined | Feature type(s) to parse. If multiple feature types need to be configured which come from different feature namespaces, `featureNS` will be an object with the keys being the prefixes used in the entries of featureType array. The values of the object will be the feature namespaces themselves. So for instance there might be a featureType item `topp:states` and then there will be a key named `topp` in the featureNS object with value `http://www.openplans.org/topp`.
  `srsName` | string | undefined | srsName to use when writing geometries.
  `surface` | boolean (defaults to false) | Write gml:Surface instead of gml:Polygon elements. This also affects the elements in multi-part geometries.
  `curve` | boolean (defaults to false) | Write gml:Curve instead of gml:LineString elements. This also affects the elements in multi-part geometries.
  `multiCurve` | boolean (defaults to true) | Write gml:MultiCurve instead of gml:MultiLineString. Since the latter is deprecated in GML 3.
  `multiSurface` | boolean (defaults to true) | Write gml:multiSurface instead of gml:MultiPolygon. Since the latter is deprecated in GML 3.
  `schemaLocation` | string | undefined | Optional schemaLocation to use when writing out the GML, this will override the default provided.
  `hasZ` | boolean (defaults to false) | If coordinates have a Z value.