Files
openlayers/src/ol/format/GML2.js
2018-03-12 08:32:09 -06:00

776 lines
23 KiB
JavaScript

/**
* @module ol/format/GML2
*/
import {inherits} from '../index.js';
import {createOrUpdate} from '../extent.js';
import {transformWithOptions} from '../format/Feature.js';
import GMLBase, {GMLNS} from '../format/GMLBase.js';
import {writeStringTextNode} from '../format/xsd.js';
import Geometry from '../geom/Geometry.js';
import {assign} from '../obj.js';
import {get as getProjection, transformExtent} from '../proj.js';
import {createElementNS, getAllTextContent, makeArrayPusher, makeChildAppender,
makeReplacer, makeSimpleNodeFactory, OBJECT_PROPERTY_NODE_FACTORY, pushParseAndPop, pushSerializeAndPop} from '../xml.js';
/**
* @const
* @type {string}
*/
const schemaLocation = GMLNS + ' http://schemas.opengis.net/gml/2.1.2/feature.xsd';
/**
* @classdesc
* Feature format for reading and writing data in the GML format,
* version 2.1.2.
*
* @constructor
* @param {module:ol/format/GMLBase~Options=} opt_options Optional configuration object.
* @extends {ol.format.GMLBase}
* @api
*/
const GML2 = function(opt_options) {
const options = /** @type {module:ol/format/GMLBase~Options} */
(opt_options ? opt_options : {});
GMLBase.call(this, options);
this.FEATURE_COLLECTION_PARSERS[GMLNS][
'featureMember'] =
makeArrayPusher(GMLBase.prototype.readFeaturesInternal);
/**
* @inheritDoc
*/
this.schemaLocation = options.schemaLocation ?
options.schemaLocation : schemaLocation;
};
inherits(GML2, GMLBase);
/**
* @param {Node} node Node.
* @param {Array.<*>} objectStack Object stack.
* @private
* @return {Array.<number>|undefined} Flat coordinates.
*/
GML2.prototype.readFlatCoordinates_ = function(node, objectStack) {
const s = getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
const context = /** @type {module:ol/xml~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 {Node} node Node.
* @param {Array.<*>} objectStack Object stack.
* @private
* @return {module:ol/extent~Extent|undefined} Envelope.
*/
GML2.prototype.readBox_ = function(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 {Node} node Node.
* @param {Array.<*>} objectStack Object stack.
* @private
*/
GML2.prototype.innerBoundaryIsParser_ = function(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 {Node} node Node.
* @param {Array.<*>} objectStack Object stack.
* @private
*/
GML2.prototype.outerBoundaryIsParser_ = function(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=} opt_nodeName Node name.
* @return {Node|undefined} Node.
* @private
*/
GML2.prototype.GEOMETRY_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
const context = objectStack[objectStack.length - 1];
const multiSurface = context['multiSurface'];
const surface = context['surface'];
const multiCurve = context['multiCurve'];
let nodeName;
if (!Array.isArray(value)) {
nodeName = /** @type {module:ol/geom/Geometry~Geometry} */ (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 {Node} node Node.
* @param {ol.Feature} feature Feature.
* @param {Array.<*>} objectStack Node stack.
*/
GML2.prototype.writeFeatureElement = function(node, feature, objectStack) {
const fid = feature.getId();
if (fid) {
node.setAttribute('fid', 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 properties = feature.getProperties();
const keys = [];
const values = [];
for (const key in properties) {
const value = properties[key];
if (value !== null) {
keys.push(key);
values.push(value);
if (key == geometryName || value instanceof Geometry) {
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 = assign({}, context);
item.node = node;
pushSerializeAndPop(/** @type {module:ol/xml~NodeStackItem} */
(item), context.serializers,
makeSimpleNodeFactory(undefined, featureNS),
values,
objectStack, keys);
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/LineString~LineString} geometry LineString geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeCurveOrLineString_ = function(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 {Node} node Node.
* @param {module:ol/geom/LineString~LineString} line LineString geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeLineStringOrCurveMember_ = function(node, line, objectStack) {
const child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
if (child) {
node.appendChild(child);
this.writeCurveOrLineString_(child, line, objectStack);
}
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/MultiLineString~MultiLineString} geometry MultiLineString geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeMultiCurveOrLineString_ = function(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 {module:ol/geom/Geometry~Geometry|module:ol/extent~Extent} geometry Geometry.
* @param {Array.<*>} objectStack Node stack.
*/
GML2.prototype.writeGeometryElement = function(node, geometry, objectStack) {
const context = /** @type {module:ol/format/Feature~WriteOptions} */ (objectStack[objectStack.length - 1]);
const item = assign({}, context);
item.node = node;
let value;
if (Array.isArray(geometry)) {
if (context.dataProjection) {
value = transformExtent(
geometry, context.featureProjection, context.dataProjection);
} else {
value = geometry;
}
} else {
value = transformWithOptions(/** @type {module:ol/geom/Geometry~Geometry} */ (geometry), true, context);
}
pushSerializeAndPop(/** @type {module:ol/xml~NodeStackItem} */
(item), this.GEOMETRY_SERIALIZERS_,
this.GEOMETRY_NODE_FACTORY_, [value],
objectStack, undefined, this);
};
/**
* @param {string} namespaceURI XML namespace.
* @returns {Node} coordinates node.
* @private
*/
GML2.prototype.createCoordinatesNode_ = function(namespaceURI) {
const coordinates = createElementNS(namespaceURI, 'coordinates');
coordinates.setAttribute('decimal', '.');
coordinates.setAttribute('cs', ',');
coordinates.setAttribute('ts', ' ');
return coordinates;
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/LineString~LineString|module:ol/geom/LinearRing~LinearRing} value Geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeCoordinates_ = function(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 {Node} node Node.
* @param {module:ol/geom/LineString~LineString} line LineString geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeCurveSegments_ = function(node, line, objectStack) {
const child = createElementNS(node.namespaceURI, 'LineStringSegment');
node.appendChild(child);
this.writeCurveOrLineString_(child, line, objectStack);
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/Polygon~Polygon} geometry Polygon geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeSurfaceOrPolygon_ = function(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=} opt_nodeName Node name.
* @return {Node} Node.
* @private
*/
GML2.prototype.RING_NODE_FACTORY_ = function(value, objectStack, opt_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 {Node} node Node.
* @param {module:ol/geom/Polygon~Polygon} polygon Polygon geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeSurfacePatches_ = function(node, polygon, objectStack) {
const child = createElementNS(node.namespaceURI, 'PolygonPatch');
node.appendChild(child);
this.writeSurfaceOrPolygon_(child, polygon, objectStack);
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/LinearRing~LinearRing} ring LinearRing geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeRing_ = function(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=} opt_srsName Optional srsName
* @param {boolean=} opt_hasZ whether the geometry has a Z coordinate (is 3D) or not.
* @return {string} The coords string.
* @private
*/
GML2.prototype.getCoords_ = function(point, opt_srsName, opt_hasZ) {
let axisOrientation = 'enu';
if (opt_srsName) {
axisOrientation = getProjection(opt_srsName).getAxisOrientation();
}
let coords = ((axisOrientation.substr(0, 2) === 'en') ?
point[0] + ',' + point[1] :
point[1] + ',' + point[0]);
if (opt_hasZ) {
// For newly created points, Z can be undefined.
const z = point[2] || 0;
coords += ',' + z;
}
return coords;
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/Point~Point} geometry Point geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writePoint_ = function(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 {Node} node Node.
* @param {module:ol/geom/MultiPoint~MultiPoint} geometry MultiPoint geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeMultiPoint_ = function(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 {Node} node Node.
* @param {module:ol/geom/Point~Point} point Point geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writePointMember_ = function(node, point, objectStack) {
const child = createElementNS(node.namespaceURI, 'Point');
node.appendChild(child);
this.writePoint_(child, point, objectStack);
};
/**
* @param {Node} node Node.
* @param {module:ol/geom/LinearRing~LinearRing} geometry LinearRing geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeLinearRing_ = function(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 {Node} node Node.
* @param {module:ol/geom/MultiPolygon~MultiPolygon} geometry MultiPolygon geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeMultiSurfaceOrPolygon_ = function(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 {module:ol/geom/Polygon~Polygon} polygon Polygon geometry.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeSurfaceOrPolygonMember_ = function(node, polygon, objectStack) {
const child = this.GEOMETRY_NODE_FACTORY_(
polygon, objectStack);
if (child) {
node.appendChild(child);
this.writeSurfaceOrPolygon_(child, polygon, objectStack);
}
};
/**
* @param {Node} node Node.
* @param {module:ol/extent~Extent} extent Extent.
* @param {Array.<*>} objectStack Node stack.
* @private
*/
GML2.prototype.writeEnvelope = function(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 {module:ol/xml~NodeStackItem} */
({node: node}), this.ENVELOPE_SERIALIZERS_,
OBJECT_PROPERTY_NODE_FACTORY,
values,
objectStack, keys, this);
};
/**
* @const
* @type {Object.<string, string>}
*/
const MULTIGEOMETRY_TO_MEMBER_NODENAME = {
'MultiLineString': 'lineStringMember',
'MultiCurve': 'curveMember',
'MultiPolygon': 'polygonMember',
'MultiSurface': 'surfaceMember'
};
/**
* @const
* @param {*} value Value.
* @param {Array.<*>} objectStack Object stack.
* @param {string=} opt_nodeName Node name.
* @return {Node|undefined} Node.
* @private
*/
GML2.prototype.MULTIGEOMETRY_MEMBER_NODE_FACTORY_ = function(value, objectStack, opt_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, module:ol/xml~Parser>>}
* @private
*/
GML2.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = {
'http://www.opengis.net/gml': {
'coordinates': makeReplacer(GML2.prototype.readFlatCoordinates_)
}
};
/**
* @const
* @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
* @private
*/
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, module:ol/xml~Parser>>}
* @private
*/
GML2.prototype.BOX_PARSERS_ = {
'http://www.opengis.net/gml': {
'coordinates': makeArrayPusher(
GML2.prototype.readFlatCoordinates_)
}
};
/**
* @const
* @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
* @private
*/
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, module:ol/xml~Serializer>>}
* @private
*/
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, module:ol/xml~Serializer>>}
* @private
*/
GML2.prototype.LINESTRINGORCURVEMEMBER_SERIALIZERS_ = {
'http://www.opengis.net/gml': {
'lineStringMember': makeChildAppender(
GML2.prototype.writeLineStringOrCurveMember_),
'curveMember': makeChildAppender(
GML2.prototype.writeLineStringOrCurveMember_)
}
};
/**
* @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
* @private
*/
GML2.prototype.RING_SERIALIZERS_ = {
'http://www.opengis.net/gml': {
'outerBoundaryIs': makeChildAppender(GML2.prototype.writeRing_),
'innerBoundaryIs': makeChildAppender(GML2.prototype.writeRing_)
}
};
/**
* @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
* @private
*/
GML2.prototype.POINTMEMBER_SERIALIZERS_ = {
'http://www.opengis.net/gml': {
'pointMember': makeChildAppender(
GML2.prototype.writePointMember_)
}
};
/**
* @const
* @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
* @private
*/
GML2.prototype.SURFACEORPOLYGONMEMBER_SERIALIZERS_ = {
'http://www.opengis.net/gml': {
'surfaceMember': makeChildAppender(
GML2.prototype.writeSurfaceOrPolygonMember_),
'polygonMember': makeChildAppender(
GML2.prototype.writeSurfaceOrPolygonMember_)
}
};
/**
* @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
* @private
*/
GML2.prototype.ENVELOPE_SERIALIZERS_ = {
'http://www.opengis.net/gml': {
'lowerCorner': makeChildAppender(writeStringTextNode),
'upperCorner': makeChildAppender(writeStringTextNode)
}
};
export default GML2;