GML2.js

/**
 * @module ol/format/GML2
 */
import GMLBase, {GMLNS} from './GMLBase.js';
import {
  OBJECT_PROPERTY_NODE_FACTORY,
  createElementNS,
  getAllTextContent,
  makeArrayPusher,
  makeChildAppender,
  makeReplacer,
  makeSimpleNodeFactory,
  pushParseAndPop,
  pushSerializeAndPop,
} from '../xml.js';
import {createOrUpdate} from '../extent.js';
import {get as getProjection} from '../proj.js';
import {
  transformExtentWithOptions,
  transformGeometryWithOptions,
} from './Feature.js';
import {writeStringTextNode} from './xsd.js';

/**
 * @const
 * @type {string}
 */
const schemaLocation =
  GMLNS + ' http://schemas.opengis.net/gml/2.1.2/feature.xsd';

/**
 * @const
 * @type {Object<string, string>}
 */
const MULTIGEOMETRY_TO_MEMBER_NODENAME = {
  'MultiLineString': 'lineStringMember',
  'MultiCurve': 'curveMember',
  'MultiPolygon': 'polygonMember',
  'MultiSurface': 'surfaceMember',
};

/**
 * @classdesc
 * Feature format for reading and writing data in the GML format,
 * version 2.1.2.
 *
 * @api
 */
class GML2 extends GMLBase {
  /**
   * @param {import("./GMLBase.js").Options} [options] Optional configuration object.
   */
  constructor(options) {
    options = options ? options : {};

    super(options);

    this.FEATURE_COLLECTION_PARSERS[GMLNS]['featureMember'] = makeArrayPusher(
      this.readFeaturesInternal,
    );

    /**
     * @type {string}
     */
    this.schemaLocation = options.schemaLocation
      ? options.schemaLocation
      : schemaLocation;
  }

  /**
   * @param {Node} node Node.
   * @param {Array<*>} objectStack Object stack.
   * @return {Array<number>|undefined} Flat coordinates.
   */
  readFlatCoordinates(node, objectStack) {
    const s = getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
    const context = /** @type {import("../xml.js").NodeStackItem} */ (
      objectStack[0]
    );
    const containerSrs = context['srsName'];
    let axisOrientation = 'enu';
    if (containerSrs) {
      const proj = getProjection(containerSrs);
      if (proj) {
        axisOrientation = proj.getAxisOrientation();
      }
    }
    const coordsGroups = s.trim().split(/\s+/);
    const flatCoordinates = [];
    for (let i = 0, ii = coordsGroups.length; i < ii; i++) {
      const coords = coordsGroups[i].split(/,+/);
      const x = parseFloat(coords[0]);
      const y = parseFloat(coords[1]);
      const z = coords.length === 3 ? parseFloat(coords[2]) : 0;
      if (axisOrientation.substr(0, 2) === 'en') {
        flatCoordinates.push(x, y, z);
      } else {
        flatCoordinates.push(y, x, z);
      }
    }
    return flatCoordinates;
  }

  /**
   * @param {Element} node Node.
   * @param {Array<*>} objectStack Object stack.
   * @return {import("../extent.js").Extent|undefined} Envelope.
   */
  readBox(node, objectStack) {
    /** @type {Array<number>} */
    const flatCoordinates = pushParseAndPop(
      [null],
      this.BOX_PARSERS_,
      node,
      objectStack,
      this,
    );
    return createOrUpdate(
      flatCoordinates[1][0],
      flatCoordinates[1][1],
      flatCoordinates[1][3],
      flatCoordinates[1][4],
    );
  }

  /**
   * @param {Element} node Node.
   * @param {Array<*>} objectStack Object stack.
   */
  innerBoundaryIsParser(node, objectStack) {
    /** @type {Array<number>|undefined} */
    const flatLinearRing = pushParseAndPop(
      undefined,
      this.RING_PARSERS,
      node,
      objectStack,
      this,
    );
    if (flatLinearRing) {
      const flatLinearRings =
        /** @type {Array<Array<number>>} */
        (objectStack[objectStack.length - 1]);
      flatLinearRings.push(flatLinearRing);
    }
  }

  /**
   * @param {Element} node Node.
   * @param {Array<*>} objectStack Object stack.
   */
  outerBoundaryIsParser(node, objectStack) {
    /** @type {Array<number>|undefined} */
    const flatLinearRing = pushParseAndPop(
      undefined,
      this.RING_PARSERS,
      node,
      objectStack,
      this,
    );
    if (flatLinearRing) {
      const flatLinearRings =
        /** @type {Array<Array<number>>} */
        (objectStack[objectStack.length - 1]);
      flatLinearRings[0] = flatLinearRing;
    }
  }

  /**
   * @const
   * @param {*} value Value.
   * @param {Array<*>} objectStack Object stack.
   * @param {string} [nodeName] Node name.
   * @return {Element|undefined} Node.
   * @private
   */
  GEOMETRY_NODE_FACTORY_(value, objectStack, nodeName) {
    const context = objectStack[objectStack.length - 1];
    const multiSurface = context['multiSurface'];
    const surface = context['surface'];
    const multiCurve = context['multiCurve'];
    if (!Array.isArray(value)) {
      nodeName = /** @type {import("../geom/Geometry.js").default} */ (
        value
      ).getType();
      if (nodeName === 'MultiPolygon' && multiSurface === true) {
        nodeName = 'MultiSurface';
      } else if (nodeName === 'Polygon' && surface === true) {
        nodeName = 'Surface';
      } else if (nodeName === 'MultiLineString' && multiCurve === true) {
        nodeName = 'MultiCurve';
      }
    } else {
      nodeName = 'Envelope';
    }
    return createElementNS('http://www.opengis.net/gml', nodeName);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../Feature.js").default} feature Feature.
   * @param {Array<*>} objectStack Node stack.
   */
  writeFeatureElement(node, feature, objectStack) {
    const fid = feature.getId();
    if (fid) {
      node.setAttribute('fid', /** @type {string} */ (fid));
    }
    const context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
    const featureNS = context['featureNS'];
    const geometryName = feature.getGeometryName();
    if (!context.serializers) {
      context.serializers = {};
      context.serializers[featureNS] = {};
    }
    const keys = [];
    const values = [];
    if (feature.hasProperties()) {
      const properties = feature.getProperties();
      for (const key in properties) {
        const value = properties[key];
        if (value !== null) {
          keys.push(key);
          values.push(value);
          if (
            key == geometryName ||
            typeof (/** @type {?} */ (value).getSimplifiedGeometry) ===
              'function'
          ) {
            if (!(key in context.serializers[featureNS])) {
              context.serializers[featureNS][key] = makeChildAppender(
                this.writeGeometryElement,
                this,
              );
            }
          } else {
            if (!(key in context.serializers[featureNS])) {
              context.serializers[featureNS][key] =
                makeChildAppender(writeStringTextNode);
            }
          }
        }
      }
    }
    const item = Object.assign({}, context);
    item.node = node;
    pushSerializeAndPop(
      /** @type {import("../xml.js").NodeStackItem} */
      (item),
      context.serializers,
      makeSimpleNodeFactory(undefined, featureNS),
      values,
      objectStack,
      keys,
    );
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/LineString.js").default} geometry LineString geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeCurveOrLineString(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const srsName = context['srsName'];
    if (node.nodeName !== 'LineStringSegment' && srsName) {
      node.setAttribute('srsName', srsName);
    }
    if (
      node.nodeName === 'LineString' ||
      node.nodeName === 'LineStringSegment'
    ) {
      const coordinates = this.createCoordinatesNode_(node.namespaceURI);
      node.appendChild(coordinates);
      this.writeCoordinates_(coordinates, geometry, objectStack);
    } else if (node.nodeName === 'Curve') {
      const segments = createElementNS(node.namespaceURI, 'segments');
      node.appendChild(segments);
      this.writeCurveSegments_(segments, geometry, objectStack);
    }
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/LineString.js").default} line LineString geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeLineStringOrCurveMember(node, line, objectStack) {
    const child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
    if (child) {
      node.appendChild(child);
      this.writeCurveOrLineString(child, line, objectStack);
    }
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/MultiLineString.js").default} geometry MultiLineString geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeMultiCurveOrLineString(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    const curve = context['curve'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const lines = geometry.getLineStrings();
    pushSerializeAndPop(
      {node: node, hasZ: hasZ, srsName: srsName, curve: curve},
      this.LINESTRINGORCURVEMEMBER_SERIALIZERS,
      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_,
      lines,
      objectStack,
      undefined,
      this,
    );
  }

  /**
   * @param {Node} node Node.
   * @param {import("../geom/Geometry.js").default|import("../extent.js").Extent} geometry Geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeGeometryElement(node, geometry, objectStack) {
    const context = /** @type {import("./Feature.js").WriteOptions} */ (
      objectStack[objectStack.length - 1]
    );
    const item = Object.assign({}, context);
    item['node'] = node;
    let value;
    if (Array.isArray(geometry)) {
      value = transformExtentWithOptions(
        /** @type {import("../extent.js").Extent} */ (geometry),
        context,
      );
    } else {
      value = transformGeometryWithOptions(
        /** @type {import("../geom/Geometry.js").default} */ (geometry),
        true,
        context,
      );
    }
    pushSerializeAndPop(
      /** @type {import("../xml.js").NodeStackItem} */
      (item),
      this.GEOMETRY_SERIALIZERS,
      this.GEOMETRY_NODE_FACTORY_,
      [value],
      objectStack,
      undefined,
      this,
    );
  }

  /**
   * @param {string} namespaceURI XML namespace.
   * @return {Element} coordinates node.
   * @private
   */
  createCoordinatesNode_(namespaceURI) {
    const coordinates = createElementNS(namespaceURI, 'coordinates');
    coordinates.setAttribute('decimal', '.');
    coordinates.setAttribute('cs', ',');
    coordinates.setAttribute('ts', ' ');

    return coordinates;
  }

  /**
   * @param {Node} node Node.
   * @param {import("../geom/LineString.js").default|import("../geom/LinearRing.js").default} value Geometry.
   * @param {Array<*>} objectStack Node stack.
   * @private
   */
  writeCoordinates_(node, value, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    // only 2d for simple features profile
    const points = value.getCoordinates();
    const len = points.length;
    const parts = new Array(len);
    for (let i = 0; i < len; ++i) {
      const point = points[i];
      parts[i] = this.getCoords_(point, srsName, hasZ);
    }
    writeStringTextNode(node, parts.join(' '));
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/LineString.js").default} line LineString geometry.
   * @param {Array<*>} objectStack Node stack.
   * @private
   */
  writeCurveSegments_(node, line, objectStack) {
    const child = createElementNS(node.namespaceURI, 'LineStringSegment');
    node.appendChild(child);
    this.writeCurveOrLineString(child, line, objectStack);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/Polygon.js").default} geometry Polygon geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeSurfaceOrPolygon(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    if (node.nodeName !== 'PolygonPatch' && srsName) {
      node.setAttribute('srsName', srsName);
    }
    if (node.nodeName === 'Polygon' || node.nodeName === 'PolygonPatch') {
      const rings = geometry.getLinearRings();
      pushSerializeAndPop(
        {node: node, hasZ: hasZ, srsName: srsName},
        this.RING_SERIALIZERS,
        this.RING_NODE_FACTORY_,
        rings,
        objectStack,
        undefined,
        this,
      );
    } else if (node.nodeName === 'Surface') {
      const patches = createElementNS(node.namespaceURI, 'patches');
      node.appendChild(patches);
      this.writeSurfacePatches_(patches, geometry, objectStack);
    }
  }

  /**
   * @param {*} value Value.
   * @param {Array<*>} objectStack Object stack.
   * @param {string} [nodeName] Node name.
   * @return {Node} Node.
   * @private
   */
  RING_NODE_FACTORY_(value, objectStack, nodeName) {
    const context = objectStack[objectStack.length - 1];
    const parentNode = context.node;
    const exteriorWritten = context['exteriorWritten'];
    if (exteriorWritten === undefined) {
      context['exteriorWritten'] = true;
    }
    return createElementNS(
      parentNode.namespaceURI,
      exteriorWritten !== undefined ? 'innerBoundaryIs' : 'outerBoundaryIs',
    );
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/Polygon.js").default} polygon Polygon geometry.
   * @param {Array<*>} objectStack Node stack.
   * @private
   */
  writeSurfacePatches_(node, polygon, objectStack) {
    const child = createElementNS(node.namespaceURI, 'PolygonPatch');
    node.appendChild(child);
    this.writeSurfaceOrPolygon(child, polygon, objectStack);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/LinearRing.js").default} ring LinearRing geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeRing(node, ring, objectStack) {
    const linearRing = createElementNS(node.namespaceURI, 'LinearRing');
    node.appendChild(linearRing);
    this.writeLinearRing(linearRing, ring, objectStack);
  }

  /**
   * @param {Array<number>} point Point geometry.
   * @param {string} [srsName] Optional srsName
   * @param {boolean} [hasZ] whether the geometry has a Z coordinate (is 3D) or not.
   * @return {string} The coords string.
   * @private
   */
  getCoords_(point, srsName, hasZ) {
    let axisOrientation = 'enu';
    if (srsName) {
      axisOrientation = getProjection(srsName).getAxisOrientation();
    }
    let coords =
      axisOrientation.substr(0, 2) === 'en'
        ? point[0] + ',' + point[1]
        : point[1] + ',' + point[0];
    if (hasZ) {
      // For newly created points, Z can be undefined.
      const z = point[2] || 0;
      coords += ',' + z;
    }

    return coords;
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/Point.js").default} geometry Point geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writePoint(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const coordinates = this.createCoordinatesNode_(node.namespaceURI);
    node.appendChild(coordinates);
    const point = geometry.getCoordinates();
    const coord = this.getCoords_(point, srsName, hasZ);
    writeStringTextNode(coordinates, coord);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/MultiPoint.js").default} geometry MultiPoint geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeMultiPoint(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const points = geometry.getPoints();
    pushSerializeAndPop(
      {node: node, hasZ: hasZ, srsName: srsName},
      this.POINTMEMBER_SERIALIZERS,
      makeSimpleNodeFactory('pointMember'),
      points,
      objectStack,
      undefined,
      this,
    );
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/Point.js").default} point Point geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writePointMember(node, point, objectStack) {
    const child = createElementNS(node.namespaceURI, 'Point');
    node.appendChild(child);
    this.writePoint(child, point, objectStack);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/LinearRing.js").default} geometry LinearRing geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeLinearRing(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const srsName = context['srsName'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const coordinates = this.createCoordinatesNode_(node.namespaceURI);
    node.appendChild(coordinates);
    this.writeCoordinates_(coordinates, geometry, objectStack);
  }

  /**
   * @param {Element} node Node.
   * @param {import("../geom/MultiPolygon.js").default} geometry MultiPolygon geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeMultiSurfaceOrPolygon(node, geometry, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const hasZ = context['hasZ'];
    const srsName = context['srsName'];
    const surface = context['surface'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const polygons = geometry.getPolygons();
    pushSerializeAndPop(
      {node: node, hasZ: hasZ, srsName: srsName, surface: surface},
      this.SURFACEORPOLYGONMEMBER_SERIALIZERS,
      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_,
      polygons,
      objectStack,
      undefined,
      this,
    );
  }

  /**
   * @param {Node} node Node.
   * @param {import("../geom/Polygon.js").default} polygon Polygon geometry.
   * @param {Array<*>} objectStack Node stack.
   */
  writeSurfaceOrPolygonMember(node, polygon, objectStack) {
    const child = this.GEOMETRY_NODE_FACTORY_(polygon, objectStack);
    if (child) {
      node.appendChild(child);
      this.writeSurfaceOrPolygon(child, polygon, objectStack);
    }
  }

  /**
   * @param {Element} node Node.
   * @param {import("../extent.js").Extent} extent Extent.
   * @param {Array<*>} objectStack Node stack.
   */
  writeEnvelope(node, extent, objectStack) {
    const context = objectStack[objectStack.length - 1];
    const srsName = context['srsName'];
    if (srsName) {
      node.setAttribute('srsName', srsName);
    }
    const keys = ['lowerCorner', 'upperCorner'];
    const values = [extent[0] + ' ' + extent[1], extent[2] + ' ' + extent[3]];
    pushSerializeAndPop(
      /** @type {import("../xml.js").NodeStackItem} */
      ({node: node}),
      this.ENVELOPE_SERIALIZERS,
      OBJECT_PROPERTY_NODE_FACTORY,
      values,
      objectStack,
      keys,
      this,
    );
  }

  /**
   * @const
   * @param {*} value Value.
   * @param {Array<*>} objectStack Object stack.
   * @param {string} [nodeName] Node name.
   * @return {Node|undefined} Node.
   * @private
   */
  MULTIGEOMETRY_MEMBER_NODE_FACTORY_(value, objectStack, nodeName) {
    const parentNode = objectStack[objectStack.length - 1].node;
    return createElementNS(
      'http://www.opengis.net/gml',
      MULTIGEOMETRY_TO_MEMBER_NODENAME[parentNode.nodeName],
    );
  }
}

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Parser>>}
 */
GML2.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS = {
  'http://www.opengis.net/gml': {
    'coordinates': makeReplacer(GML2.prototype.readFlatCoordinates),
  },
};

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Parser>>}
 */
GML2.prototype.FLAT_LINEAR_RINGS_PARSERS = {
  'http://www.opengis.net/gml': {
    'innerBoundaryIs': GML2.prototype.innerBoundaryIsParser,
    'outerBoundaryIs': GML2.prototype.outerBoundaryIsParser,
  },
};

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Parser>>}
 */
GML2.prototype.BOX_PARSERS_ = {
  'http://www.opengis.net/gml': {
    'coordinates': makeArrayPusher(GML2.prototype.readFlatCoordinates),
  },
};

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Parser>>}
 */
GML2.prototype.GEOMETRY_PARSERS = {
  'http://www.opengis.net/gml': {
    'Point': makeReplacer(GMLBase.prototype.readPoint),
    'MultiPoint': makeReplacer(GMLBase.prototype.readMultiPoint),
    'LineString': makeReplacer(GMLBase.prototype.readLineString),
    'MultiLineString': makeReplacer(GMLBase.prototype.readMultiLineString),
    'LinearRing': makeReplacer(GMLBase.prototype.readLinearRing),
    'Polygon': makeReplacer(GMLBase.prototype.readPolygon),
    'MultiPolygon': makeReplacer(GMLBase.prototype.readMultiPolygon),
    'Box': makeReplacer(GML2.prototype.readBox),
  },
};

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.GEOMETRY_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'Curve': makeChildAppender(GML2.prototype.writeCurveOrLineString),
    'MultiCurve': makeChildAppender(GML2.prototype.writeMultiCurveOrLineString),
    'Point': makeChildAppender(GML2.prototype.writePoint),
    'MultiPoint': makeChildAppender(GML2.prototype.writeMultiPoint),
    'LineString': makeChildAppender(GML2.prototype.writeCurveOrLineString),
    'MultiLineString': makeChildAppender(
      GML2.prototype.writeMultiCurveOrLineString,
    ),
    'LinearRing': makeChildAppender(GML2.prototype.writeLinearRing),
    'Polygon': makeChildAppender(GML2.prototype.writeSurfaceOrPolygon),
    'MultiPolygon': makeChildAppender(
      GML2.prototype.writeMultiSurfaceOrPolygon,
    ),
    'Surface': makeChildAppender(GML2.prototype.writeSurfaceOrPolygon),
    'MultiSurface': makeChildAppender(
      GML2.prototype.writeMultiSurfaceOrPolygon,
    ),
    'Envelope': makeChildAppender(GML2.prototype.writeEnvelope),
  },
};

/**
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.LINESTRINGORCURVEMEMBER_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'lineStringMember': makeChildAppender(
      GML2.prototype.writeLineStringOrCurveMember,
    ),
    'curveMember': makeChildAppender(
      GML2.prototype.writeLineStringOrCurveMember,
    ),
  },
};

/**
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.RING_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'outerBoundaryIs': makeChildAppender(GML2.prototype.writeRing),
    'innerBoundaryIs': makeChildAppender(GML2.prototype.writeRing),
  },
};

/**
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.POINTMEMBER_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'pointMember': makeChildAppender(GML2.prototype.writePointMember),
  },
};

/**
 * @const
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.SURFACEORPOLYGONMEMBER_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'surfaceMember': makeChildAppender(
      GML2.prototype.writeSurfaceOrPolygonMember,
    ),
    'polygonMember': makeChildAppender(
      GML2.prototype.writeSurfaceOrPolygonMember,
    ),
  },
};

/**
 * @type {Object<string, Object<string, import("../xml.js").Serializer>>}
 */
GML2.prototype.ENVELOPE_SERIALIZERS = {
  'http://www.opengis.net/gml': {
    'lowerCorner': makeChildAppender(writeStringTextNode),
    'upperCorner': makeChildAppender(writeStringTextNode),
  },
};

export default GML2;