Try to build BuildingXmlNode

src/eu/simstadt/lowlevelgmlparser/BuildingXmlNode.java

+package eu.simstadt.lowlevelgmlparser;
+
+import com.ximpleware.AutoPilot;
+import com.ximpleware.NavException;
+import com.ximpleware.VTDNav;
+
+
+public class BuildingXmlNode
+{
+
+	private int buildingOffset;
+	private int buildingLength;
+	private VTDNav navigator;
+	private AutoPilot coordinatesFinder;
+
+	public BuildingXmlNode(VTDNav navigator, int buildingOffset, int buildingLength) {
+		this.navigator = navigator;
+		this.coordinatesFinder = new AutoPilot(navigator); //COULD BE STATIC?
+		this.buildingLength = buildingLength;
+		this.buildingOffset = buildingOffset;
+	}
+
+	public String toString() {
+		try {
+			return navigator.toRawString(buildingOffset, buildingLength);
+		} catch (NavException ex) {
+			return null;
+		}
+	}
+
+}

src/eu/simstadt/lowlevelgmlparser/CityGmlIterator.java

@@ -55,7 +55,8 @@ public String next() {
 					offsetAndLength = navigator.getElementFragment();
 					buildingOffset = (int) offsetAndLength;
 					buildingLength = (int) (offsetAndLength >> 32);
-					return navigator.toRawString(buildingOffset, buildingLength);
+					BuildingXmlNode b = new BuildingXmlNode(navigator, buildingOffset, buildingLength);
+					return b.toString();
 				} catch (NavException ex) {}
 				return null;
 			}

src/eu/simstadt/regionchooser/RegionExtractor.java

@@ -18,6 +18,7 @@
 import com.ximpleware.VTDNav;
 import com.ximpleware.XPathEvalException;
 import com.ximpleware.XPathParseException;
+import eu.simstadt.lowlevelgmlparser.CityGmlIterator;
 
 
 public class RegionExtractor
@@ -30,6 +31,12 @@ static public StringBuffer selectRegionDirectlyFromCityGML(Path citygmlPath, Str
 			throws SAXParseException, XMLStreamException, ParseException, XPathParseException, NavException,
 			NumberFormatException, XPathEvalException, IOException {
 
+		CityGmlIterator citygml = new CityGmlIterator(citygmlPath);
+
+		for (String lowLevelBuildingXML : citygml) {
+			System.out.println(lowLevelBuildingXML.length());
+		}
+
 		Geometry poly = wktReader.read(wktPolygon);
 		final GeometryFactory gf = new GeometryFactory();
 		StringBuffer sb = new StringBuffer();