flex 中GML转换

package org.openscales.core.format
{
 import flash.utils.getQualifiedClassName;
 import flash.xml.XMLNode;
 import org.openscales.core.Util;
 import org.openscales.core.feature.Feature;
 import org.openscales.core.geometry.Collection;
 import org.openscales.core.geometry.LineString;
 import org.openscales.core.geometry.LinearRing;
 import org.openscales.core.geometry.MultiLineString;
 import org.openscales.core.geometry.MultiPoint;
 import org.openscales.core.geometry.MultiPolygon;
 import org.openscales.core.geometry.Point;
 import org.openscales.core.geometry.Polygon;
 import org.openscales.proj4as.Proj4as;
 import org.openscales.proj4as.ProjPoint;
 import org.openscales.proj4as.ProjProjection;
 import org.openscales.core.feature.Feature;
 import org.openscales.core.feature.PointFeature;
 import org.openscales.core.feature.MultiPointFeature;
 import org.openscales.core.feature.LineStringFeature;
 import org.openscales.core.feature.MultiLineStringFeature;
 import org.openscales.core.feature.PolygonFeature;
 import org.openscales.core.feature.MultiPolygonFeature;
 import org.openscales.core.Trace;
 /**
  * Read/Write GML. Supports the GML simple features profile.
  */
 public class GMLFormat extends Format
 {
  protected var _featureNS:String = "http://openscales.org/OpenScales";
  protected var _featureName:String = "featureMember";
  protected var _featurePrefix:String = "OpenScales";
  protected var _layerName:String = "features";
  protected var _geometryName:String = "geometry";
  protected var _collectionName:String = "FeatureCollection";
  protected var _gmlns:String = "http://www.opengis.net/gml";
  protected var _gmlprefix:String = "gml";
  protected var _wfsns:String = "http://www.opengis.net