Add importer exporter for resource module

src/main/java/org/citygml4j/ade/energy3/bind/EnergyADEUnmarshaller.java

 package org.citygml4j.ade.energy3.bind;
 
 import lombok.SneakyThrows;
+import net.opengis.citygml._1.ExternalReferenceType;
 import net.opengis.gml.*;
 import org.citygml4j.ade.energy3.model.core.*;
 import org.citygml4j.ade.energy3.model.supportingClasses.*;
 import org.citygml4j.builder.jaxb.unmarshal.citygml.ade.ADEUnmarshallerHelper;
 import org.citygml4j.model.citygml.ade.binding.ADEModelObject;
 import org.citygml4j.model.citygml.ade.binding.ADEUnmarshaller;
+import org.citygml4j.model.citygml.core.ExternalReference;
 import org.citygml4j.model.common.base.ModelObject;
 import org.citygml4j.model.gml.xlink.XLinkActuate;
 import org.citygml4j.model.gml.xlink.XLinkShow;
@@ -84,6 +86,8 @@ public class EnergyADEUnmarshaller implements ADEUnmarshaller {
                             .with(AbstractDevicePropertyType.class, this::unmarshalAbstractDeviceProperty)
                             .with(WeatherDataPropertyType.class, this::unmarshalWeatherDataProperty)
                             .with(WeatherDataType.class, this::unmarshalWeatherData)
+                            .with(AbstractFeatureWithLifeSpanPropertyType.class, this::AbstractFeatureWithLifeSpanProperty)
+                            .with(AbstractADEFeaturePropertyType.class, this::unmarshalAbstractADEFeatureProperty)
                             .with(JAXBElement.class, this::unmarshal);
                 }
             } finally {
@@ -131,6 +135,8 @@ public class EnergyADEUnmarshaller implements ADEUnmarshaller {
                 return new ReferencePointProperty(helper.getGMLUnmarshaller().unmarshalPointProperty((PointPropertyType) value));
             case "suitability":
                 return new SuitabilityProperty((SuitabilityPropertyType) value);
+//            case "externalReference":
+//                return new ExternalReferenceProperty((ExternalReferenceProperty)value);
         }
 
         // all other types

src/main/java/org/citygml4j/ade/energy3/model/module/EnergyADEModule.java

@@ -43,6 +43,8 @@ public class EnergyADEModule extends ADEModule {
         features.put("Food", Food.class);
         features.put("OtherResource", OtherResource.class);
         features.put("ConstructionMaterial", ConstructionMaterial.class);
+        features.put("AbstractADEFeature", AbstractADEFeature.class);
+        features.put("AbstractFeatureWithLifeSpan", AbstractFeatureWithLifeSpan.class);
         featureProperties = new HashSet<>();
 
     }

src/main/java/org/citygml4j/ade/energy3/model/supportingClasses/ExternalReference.java

+package org.citygml4j.ade.energy3.model.supportingClasses;
+
+import java.net.URI;
+
+public class ExternalReference {
+
+//    private URI informationSystem;
+    private URI informationSystem;
+    private String externalObject;
+
+}

src/main/java/org/citygml4j/ade/energy3/model/supportingClasses/ExternalReferenceProperty.java

+//package org.citygml4j.ade.energy3.model.supportingClasses;
+//
+//import org.citygml4j.builder.copy.CopyBuilder;
+//import org.citygml4j.model.citygml.ade.binding.ADEModelObject;
+//import org.citygml4j.model.citygml.core.ExternalReference;
+//import org.citygml4j.model.gml.base.AssociationByRepOrRef;
+//
+//public class ExternalReferenceProperty extends AssociationByRepOrRef<ExternalReference> implements ADEModelObject {
+//
+//    public ExternalReferenceProperty() {
+//    }
+//    public ExternalReferenceProperty(ExternalReference externalReference) {
+//        super(externalReference);
+//    }
+//
+//    public ExternalReferenceProperty(String href) {
+//        super(href);
+//    }
+//
+//    public ExternalReference getExternalReference() {
+//        return super.getObject();
+//    }
+//
+//    public boolean isSetExternalReference() {
+//        return super.isSetObject();
+//    }
+//
+//    public void setExternalReference(ExternalReference externalReference) {
+//        super.setObject(externalReference);
+//    }
+//
+//    public void unsetExternalReference() {
+//        super.unsetObject();
+//    }
+//
+//    @Override
+//    public Class<ExternalReference> getAssociableClass() {
+//        return ExternalReference.class;
+//    }
+//
+//    @Override
+//    public Object copy(CopyBuilder copyBuilder) {
+//        return copyTo(new ExternalReferenceProperty(), copyBuilder);
+//    }
+//
+//    @Override
+//    public Object copyTo(Object target, CopyBuilder copyBuilder) {
+//        ExternalReferenceProperty copy = (target == null) ? new ExternalReferenceProperty() : (ExternalReferenceProperty) target;
+//        return super.copyTo(copy, copyBuilder);
+//    }
+//}