Add a parser for reading and writing KML.

This adds ol.parser.ogc.KML which can be used to read and write KML documents.
NetworkLinks are retrieved asynchronously.
Current caveats of the implementation are:

* LabelStyle not yet implemented. Missing support in renderers.
* When using shared structures the parser needs to be configured with
  dimension 2.
* We need a better way to disable fill, currently we use opacity as a
  workaround.
* We cannot really roundtrip documents, since some of the info is not
  preserved in the ol structures. But we can write out most of the important
  info.

test/spec/ol/parser/ogc/kml.test.js

@@ -0,0 +1,289 @@
+goog.provide('ol.test.parser.ogc.kml');
+
+describe('ol.parser.kml', function() {
+
+  var parser = new ol.parser.ogc.KML();
+
+  describe('Test KML parser', function() {
+    it('Polygon read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_polygon.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var output = parser.write(obj);
+        var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+            '<Document><name>Polygon.kml</name><open>0</open><Placemark>' +
+            '<name>hollow box</name><Polygon><outerBoundaryIs><LinearRing>' +
+            '<coordinates>-122.366278,37.818844,30 ' +
+            '-122.365248,37.819267,30 ' +
+            '-122.36564,37.819861,30 ' +
+            '-122.366669,37.819429,30 ' +
+            '-122.366278,37.818844,30</coordinates></LinearRing>' +
+            '</outerBoundaryIs><innerBoundaryIs><LinearRing><coordinates>' +
+            '-122.366212,37.818977,30 ' +
+            '-122.365424,37.819294,30 ' +
+            '-122.365704,37.819731,30 ' +
+            '-122.366488,37.819402,30 ' +
+            '-122.366212,37.818977,30</coordinates></LinearRing>' +
+            '</innerBoundaryIs></Polygon></Placemark></Document></kml>';
+        expect(output).to.eql(expected);
+        expect(obj.features.length).to.eql(1);
+        var geom = obj.features[0].getGeometry();
+        expect(geom instanceof ol.geom.Polygon).to.be.ok();
+        expect(geom.dimension).to.eql(3);
+      });
+    });
+    it('Linestring read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_linestring.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var output = parser.write(obj);
+        var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+            '<Document><name>LineString.kml</name><open>1</open><Placemark>' +
+            '<name>unextruded</name><LineString><coordinates>-122.364383,' +
+            '37.824664,0 -122.364152,37.824322,0</coordinates></LineString>' +
+            '</Placemark><Placemark><name>extruded</name><LineString>' +
+            '<coordinates>-122.364167,37.824787,50 -122.363917,37.824423,50' +
+            '</coordinates></LineString></Placemark></Document></kml>';
+        expect(output).to.eql(expected);
+        expect(obj.features.length).to.eql(2);
+        var geom = obj.features[0].getGeometry();
+        expect(geom instanceof ol.geom.LineString).to.be.ok();
+        expect(geom.dimension).to.eql(3);
+        geom = obj.features[1].getGeometry();
+        expect(geom instanceof ol.geom.LineString).to.be.ok();
+      });
+    });
+    it('Point read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_point.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var output = parser.write(obj);
+        var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+            '<Document><Placemark><name>Simple placemark</name><description>' +
+            'Attached to the ground. Intelligently places itself \n' +
+            '       at the height of the underlying terrain.</description>' +
+            '<Point><coordinates>-122.0822035425683,37.42228990140251,0' +
+            '</coordinates></Point></Placemark></Document></kml>';
+        expect(output).to.eql(expected);
+        expect(obj.features.length).to.eql(1);
+        var geom = obj.features[0].getGeometry();
+        expect(geom instanceof ol.geom.Point).to.be.ok();
+        expect(geom.dimension).to.eql(3);
+      });
+    });
+    it('NetworkLink read correctly', function(done) {
+      var url = 'spec/ol/parser/ogc/xml/kml_networklink.kml';
+      afterLoadXml(url, function(xml) {
+        var p = new ol.parser.ogc.KML({maxDepth: 1});
+        // we need to supply a callback to get visited NetworkLinks
+        var obj = p.read(xml, function(features) {
+          expect(features.length).to.eql(3);
+          done();
+        });
+      });
+    });
+    it('NetworkLink read correctly [recursively]', function(done) {
+      var url = 'spec/ol/parser/ogc/xml/kml_networklink_depth.kml';
+      afterLoadXml(url, function(xml) {
+        var p = new ol.parser.ogc.KML({maxDepth: 2});
+        // we need to supply a callback to get visited NetworkLinks
+        var obj = p.read(xml, function(features) {
+          expect(features.length).to.eql(2);
+          done();
+        });
+      });
+    });
+    it('NetworkLink maxDepth', function(done) {
+      var url = 'spec/ol/parser/ogc/xml/kml_networklink_depth.kml';
+      afterLoadXml(url, function(xml) {
+        var p = new ol.parser.ogc.KML({maxDepth: 1});
+        // we need to supply a callback to get visited NetworkLinks
+        var obj = p.read(xml, function(features) {
+          // since maxDepth is 1, we will not get to the second feature
+          expect(features.length).to.eql(1);
+          done();
+        });
+      });
+    });
+    it('Extended data read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_extended_data.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        expect(obj.features[0].get('name')).to.eql('Extended data placemark');
+        var description = 'Attached to the ground. Intelligently places ' +
+            'itself \n       at the height of the underlying terrain.';
+        expect(obj.features[0].get('description')).to.eql(description);
+        expect(obj.features[0].get('foo')).to.eql('bar');
+      });
+    });
+    it('Extended data read correctly [2]', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_extended_data2.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var feature = obj.features[0];
+        expect(feature.get('TrailHeadName')).to.eql('Pi in the sky');
+        expect(feature.get('TrailLength')).to.eql('3.14159');
+        expect(feature.get('ElevationGain')).to.eql('10');
+      });
+    });
+    it('Multi geometry read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_multigeometry.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var geom = obj.features[0].getGeometry();
+        var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+            '<Document><name>Polygon.kml</name><open>0</open><Placemark>' +
+            '<name>SF Marina Harbor Master</name><MultiGeometry><LineString>' +
+            '<coordinates>-122.4425587930444,37.80666418607323,0 ' +
+            '-122.4428379594768,37.80663578323093,0</coordinates>' +
+            '</LineString><LineString><coordinates>-122.4425509770566,' +
+            '37.80662588061205,0 -122.4428340530617,37.8065999493009,0' +
+            '</coordinates></LineString></MultiGeometry></Placemark>' +
+            '</Document></kml>';
+        var output = parser.write(obj);
+        expect(output).to.eql(expected);
+        expect(geom instanceof ol.geom.MultiLineString).to.be.ok();
+      });
+    });
+    it('Discrete multi geometry read correctly', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_multigeometry_discrete.kml';
+      afterLoadXml(url, function(xml) {
+        var obj = parser.read(xml);
+        var geom = obj.features[0].getGeometry();
+        expect(geom instanceof ol.geom.GeometryCollection).to.be.ok();
+        expect(geom.components.length).to.eql(2);
+        expect(geom.components[0] instanceof ol.geom.LineString).to.be.ok();
+        expect(geom.components[1] instanceof ol.geom.Point).to.be.ok();
+      });
+    });
+    it('Test extract tracks', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_macnoise.kml';
+      afterLoadXml(url, function(xml) {
+        var p = new ol.parser.ogc.KML({extractStyles: true,
+          trackAttributes: ['speed', 'num']});
+        var obj = p.read(xml);
+        expect(obj.features.length).to.eql(170);
+        var attr = obj.features[4].getAttributes();
+        // standard track point attributes
+        expect(attr['when'] instanceof Date).to.be.ok();
+        expect(attr['when'].getTime()).to.eql(1272736815000);
+        expect(attr['altitude']).to.eql(1006);
+        expect(attr['heading']).to.eql(230);
+        expect(attr['tilt']).to.eql(0);
+        expect(attr['roll']).to.eql(0);
+        expect(attr['name']).to.eql('B752');
+        expect(attr['adflag']).to.eql('A');
+        expect(attr['flightid']).to.eql('DAL2973');
+        expect(attr['speed']).to.eql('166');
+        expect(attr['num']).to.eql('50');
+        var geom = obj.features[4].getGeometry();
+        expect(geom.get(0)).to.eql(-93.0753620391713);
+        expect(geom.get(1)).to.eql(44.9879724110872);
+        expect(geom.get(2)).to.eql(1006);
+      });
+    });
+    it('Test CDATA attributes', function() {
+      var cdata = '<kml xmlns="http://earth.google.com/kml/2.0"><Document>' +
+          '<Placemark><name><![CDATA[Pezinok]]> </name><description>' +
+          '<![CDATA[Full of text.]]></description><styleUrl>#rel1.0' +
+          '</styleUrl><Point> <coordinates>17.266666, 48.283333</coordinates>' +
+          '</Point></Placemark></Document></kml>';
+      var obj = parser.read(cdata);
+      expect(obj.features[0].get('description')).to.eql('Full of text.');
+      expect(obj.features[0].get('name')).to.eql('Pezinok');
+    });
+    it('Test line style', function() {
+      var test_style = '<kml xmlns="http://earth.google.com/kml/2.0"> ' +
+          '<Placemark>    <Style> <LineStyle> <color>870000ff</color> ' +
+          '<width>10</width> </LineStyle> </Style>  <LineString> ' +
+          '<coordinates> -112,36 -113,37 </coordinates> </LineString>' +
+          '</Placemark></kml>';
+      var p = new ol.parser.ogc.KML({extractStyles: true});
+      var obj = p.read(test_style);
+      var output = p.write(obj);
+      var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+          '<Document><Placemark><Style><LineStyle><color>870000ff</color>' +
+          '<width>10</width></LineStyle></Style><LineString><coordinates>' +
+          '-112,36 -113,37</coordinates></LineString></Placemark>' +
+          '</Document></kml>';
+      expect(output).to.eql(expected);
+      var symbolizer = obj.features[0].getSymbolizerLiterals()[0];
+      expect(symbolizer instanceof ol.style.LineLiteral).to.be.ok();
+      expect(symbolizer.strokeColor).to.eql('#ff0000');
+      expect(symbolizer.opacity).to.eql(0.5294117647058824);
+      expect(symbolizer.strokeWidth).to.eql(10);
+    });
+    it('Test style fill', function() {
+      var test_style_fill = '<kml xmlns="http://earth.google.com/kml/2.0"> ' +
+          '<Placemark>    <Style> <PolyStyle> <fill>1</fill> ' +
+          '<color>870000ff</color> <width>10</width> </PolyStyle> </Style>' +
+          '<Polygon><outerBoundaryIs><LinearRing><coordinates>' +
+          '5.001370157823406,49.26855713824488 8.214706453896161,' +
+          '49.630662409673505 8.397385910100951,48.45172350357396 ' +
+          '5.001370157823406,49.26855713824488</coordinates></LinearRing>' +
+          '</outerBoundaryIs></Polygon></Placemark><Placemark>    <Style> ' +
+          '<PolyStyle><fill>0</fill><color>870000ff</color><width>10</width> ' +
+          '</PolyStyle> </Style>' +
+          '<Polygon><outerBoundaryIs><LinearRing><coordinates>' +
+          '5.001370157823406,49.26855713824488 8.214706453896161,' +
+          '49.630662409673505 8.397385910100951,48.45172350357396 ' +
+          '5.001370157823406,49.26855713824488</coordinates></LinearRing>' +
+          '</outerBoundaryIs></Polygon></Placemark></kml>';
+      var p = new ol.parser.ogc.KML({extractStyles: true});
+      var obj = p.read(test_style_fill);
+      var output = p.write(obj);
+      var expected = '<kml xmlns="http://www.opengis.net/kml/2.2"><Document>' +
+          '<Placemark><Style><PolyStyle><fill>1</fill><color>870000ff' +
+          '</color><width>10</width></PolyStyle></Style><Polygon>' +
+          '<outerBoundaryIs><LinearRing><coordinates>5.001370157823406,' +
+          '49.26855713824488 8.214706453896161,49.630662409673505 ' +
+          '8.397385910100951,48.45172350357396 5.001370157823406,' +
+          '49.26855713824488</coordinates></LinearRing></outerBoundaryIs>' +
+          '</Polygon></Placemark><Placemark><Style><PolyStyle><fill>0</fill>' +
+          '<color>00000ff</color><width>10</width></PolyStyle></Style>' +
+          '<Polygon><outerBoundaryIs><LinearRing><coordinates>' +
+          '5.001370157823406,49.26855713824488 8.214706453896161,' +
+          '49.630662409673505 8.397385910100951,48.45172350357396 ' +
+          '5.001370157823406,49.26855713824488</coordinates></LinearRing>' +
+          '</outerBoundaryIs></Polygon></Placemark></Document></kml>';
+      expect(output).to.eql(expected);
+      var symbolizer1 = obj.features[0].getSymbolizerLiterals()[0];
+      var symbolizer2 = obj.features[1].getSymbolizerLiterals()[0];
+      expect(symbolizer1.fillColor).to.eql('#ff0000');
+      expect(symbolizer2.opacity).to.eql(0);
+    });
+    it('Test iconStyle', function() {
+      var url = 'spec/ol/parser/ogc/xml/kml_iconstyle.kml';
+      afterLoadXml(url, function(xml) {
+        var p = new ol.parser.ogc.KML({extractStyles: true});
+        var obj = p.read(xml);
+        var output = p.write(obj);
+        var expected = '<kml xmlns="http://www.opengis.net/kml/2.2">' +
+            '<Document><Style id="pushpin"><IconStyle id="mystyle">' +
+            '<Icon><href>http://maps.google.com/mapfiles/kml/pushpin/' +
+            'ylw-pushpin.png</href></Icon></IconStyle></Style>' +
+            '<Placemark><name>Pin on a mountaintop</name><styleUrl>' +
+            '#pushpin</styleUrl><Point><coordinates>170.1435558771009,' +
+            '-43.60505741890396,0</coordinates></Point></Placemark>' +
+            '</Document></kml>';
+        expect(output).to.eql(expected);
+        var symbolizer = obj.features[0].getSymbolizerLiterals()[0];
+        var url = 'http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png';
+        expect(symbolizer.url).to.eql(url);
+        expect(symbolizer.width).to.eql(32);
+        expect(symbolizer.height).to.eql(32);
+      });
+    });
+  });
+});
+
+goog.require('goog.net.XhrIo');
+
+goog.require('ol.Feature');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.parser.ogc.KML');
+goog.require('ol.style.LineLiteral');

test/spec/ol/parser/ogc/xml/kml_depth.kml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+    <Document>
+    <NetworkLink><Link><href>spec/ol/parser/ogc/xml/kml_polygon.kml</href></Link></NetworkLink>
+    </Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_extended_data.kml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+  <Placemark>
+    <name>Extended data placemark</name>
+    <description>Attached to the ground. Intelligently places itself 
+       at the height of the underlying terrain.</description>
+    <ExtendedData>
+      <Data name="foo">
+        <value>bar</value>
+      </Data>
+    </ExtendedData>
+    <Point>
+      <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
+    </Point>
+  </Placemark>
+</kml>

test/spec/ol/parser/ogc/xml/kml_extended_data2.kml

@@ -0,0 +1,30 @@
+<kml xmlns="http://earth.google.com/kml/2.2">
+<Document>
+<Placemark>
+  <name>Easy trail</name>
+  <ExtendedData>
+    <SchemaData schemaUrl="#TrailHeadTypeId">
+      <SimpleData name="TrailHeadName">Pi in the sky</SimpleData>
+      <SimpleData name="TrailLength">3.14159</SimpleData>
+      <SimpleData name="ElevationGain">10</SimpleData>
+    </SchemaData>
+    </ExtendedData>
+    <Point>
+      <coordinates>-122.000,37.002</coordinates>
+    </Point>
+</Placemark>
+<Placemark>
+  <name>Difficult trail</name>
+  <ExtendedData>
+    <SchemaData schemaUrl="#TrailHeadTypeId">
+      <SimpleData name="TrailHeadName">Mount Everest</SimpleData>
+      <SimpleData name="TrailLength">347.45</SimpleData>
+      <SimpleData name="ElevationGain">10000</SimpleData>
+    </SchemaData>
+  </ExtendedData>
+  <Point>
+    <coordinates>-122.000,37.002</coordinates>
+  </Point>
+</Placemark>
+</Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_iconstyle.kml

@@ -0,0 +1,23 @@
+<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2">
+  <Document>
+    <Style id="pushpin">
+      <IconStyle id="mystyle">
+        <color>ffffffff</color>
+        <colorMode>normal</colorMode>
+        <scale>1</scale>
+        <heading>0</heading>
+        <Icon>
+          <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
+        </Icon>
+        <hotSpot x="0.5"  y="0.5" xunits="fraction" yunits="fraction"/>
+      </IconStyle>
+    </Style>
+    <Placemark id="mountainpin1">
+      <name>Pin on a mountaintop</name>
+      <styleUrl>#pushpin</styleUrl>
+      <Point>
+        <coordinates>170.1435558771009,-43.60505741890396,0</coordinates>
+      </Point>
+    </Placemark>
+  </Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_linestring.kml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+<Document>
+  <name>LineString.kml</name>
+  <open>1</open>
+  <LookAt>
+    <longitude>-122.36415</longitude>
+    <latitude>37.824553</latitude>
+    <altitude>0</altitude>
+    <range>150</range>
+    <tilt>50</tilt>
+    <heading>0</heading>
+  </LookAt>
+  <Placemark>
+    <name>unextruded</name>
+    <LineString>
+      <extrude>1</extrude>
+      <tessellate>1</tessellate>
+      <coordinates>
+        -122.364383,37.824664,0 -122.364152,37.824322,0
+      </coordinates>
+    </LineString>
+  </Placemark>
+  <Placemark>
+    <name>extruded</name>
+    <LineString>
+      <extrude>1</extrude>
+      <tessellate>1</tessellate>
+      <altitudeMode>relativeToGround</altitudeMode>
+      <coordinates>
+        -122.364167,37.824787,50 -122.363917,37.824423,50
+      </coordinates>
+    </LineString>
+  </Placemark>
+</Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_multigeometry.kml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+<Document>
+  <name>Polygon.kml</name>
+  <open>0</open>
+  <Placemark>
+    <name>SF Marina Harbor Master</name>
+    <visibility>0</visibility>
+    <MultiGeometry>
+      <LineString>
+        <!-- north wall -->
+        <coordinates>
+          -122.4425587930444,37.80666418607323,0
+          -122.4428379594768,37.80663578323093,0
+        </coordinates>
+      </LineString>
+      <LineString>
+        <!-- south wall -->
+        <coordinates>
+          -122.4425509770566,37.80662588061205,0
+          -122.4428340530617,37.8065999493009,0
+        </coordinates>
+      </LineString>
+    </MultiGeometry>
+  </Placemark>
+</Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_multigeometry_discrete.kml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+<Document>
+  <name>Polygon.kml</name>
+  <open>0</open>
+  <Placemark>
+    <name>SF Marina Harbor Master</name>
+    <visibility>0</visibility>
+    <MultiGeometry>
+      <LineString>
+        <!-- north wall -->
+        <coordinates>
+          -122.4425587930444,37.80666418607323,0
+          -122.4428379594768,37.80663578323093,0
+        </coordinates>
+      </LineString>
+      <Point>
+        <coordinates>
+          -122.4428340530617,37.8065999493009,0
+        </coordinates>
+      </Point>
+    </MultiGeometry>
+  </Placemark>
+</Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_networklink.kml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+    <Document>
+    <Placemark>
+        <name>Simple placemark</name>
+        <description>Attached to the ground. Intelligently places itself
+            at the height of the underlying terrain.</description>
+        <Point>
+            <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
+        </Point>
+    </Placemark>
+    <NetworkLink><Link><href>spec/ol/parser/ogc/xml/kml_polygon.kml</href></Link></NetworkLink>
+    <NetworkLink><Link><href>spec/ol/parser/ogc/xml/kml_point.kml</href></Link></NetworkLink>
+    </Document>   
+</kml>

test/spec/ol/parser/ogc/xml/kml_networklink_depth.kml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+    <Document>
+    <Placemark>
+        <name>Simple placemark</name>
+        <description>Attached to the ground. Intelligently places itself
+            at the height of the underlying terrain.</description>
+        <Point>
+            <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
+        </Point>
+    </Placemark>
+    <NetworkLink><Link><href>spec/ol/parser/ogc/xml/kml_depth.kml</href></Link></NetworkLink>
+    </Document>
+</kml>

test/spec/ol/parser/ogc/xml/kml_point.kml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+  <Placemark>
+    <name>Simple placemark</name>
+    <description>Attached to the ground. Intelligently places itself 
+       at the height of the underlying terrain.</description>
+    <Point>
+      <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
+    </Point>
+  </Placemark>
+</kml>

test/spec/ol/parser/ogc/xml/kml_polygon.kml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+<Document>
+  <name>Polygon.kml</name>
+  <open>0</open>
+  <Placemark>
+    <name>hollow box</name>
+    <Polygon>
+      <extrude>1</extrude>
+      <altitudeMode>relativeToGround</altitudeMode>
+      <outerBoundaryIs>
+        <LinearRing>
+          <coordinates>
+            -122.366278,37.818844,30
+            -122.365248,37.819267,30
+            -122.365640,37.819861,30
+            -122.366669,37.819429,30
+            -122.366278,37.818844,30
+          </coordinates>
+        </LinearRing>
+      </outerBoundaryIs>
+      <innerBoundaryIs>
+        <LinearRing>
+          <coordinates>
+            -122.366212,37.818977,30
+            -122.365424,37.819294,30
+            -122.365704,37.819731,30
+            -122.366488,37.819402,30
+            -122.366212,37.818977,30
+          </coordinates>
+        </LinearRing>
+      </innerBoundaryIs>
+    </Polygon>
+  </Placemark>
+</Document>
+</kml>