Added an inteface HasAttribute which can be used for any class to serial...

ksoap2-base/src/main/java/org/ksoap2/serialization/AttributeContainer.java

@@ -2,7 +2,7 @@
 
 import java.util.Vector;
 
-public class AttributeContainer {
+public class AttributeContainer implements HasAttributes{
     protected Vector attributes = new Vector();
 
     /**

ksoap2-base/src/main/java/org/ksoap2/serialization/HasAttributes.java

@@ -0,0 +1,12 @@
+package org.ksoap2.serialization;
+
+/**
+ * Common inteface for classes which want to serialize attributes to outgoing soap message
+ * @author robocik
+ */
+public interface HasAttributes
+{
+    int getAttributeCount();
+
+    void getAttributeInfo(int index, AttributeInfo info);
+}

ksoap2-base/src/main/java/org/ksoap2/serialization/SoapSerializationEnvelope.java

@@ -563,8 +563,8 @@ public void writeBody(XmlSerializer writer) throws IOException {
         }
     }
 
-     private void writeAttributes(XmlSerializer writer,AttributeContainer obj) throws IOException {
-        AttributeContainer soapObject= (AttributeContainer) obj;
+     private void writeAttributes(XmlSerializer writer,HasAttributes obj) throws IOException {
+         HasAttributes soapObject= (HasAttributes) obj;
         int cnt = soapObject.getAttributeCount();
         for (int counter = 0; counter < cnt; counter++) {
             AttributeInfo attributeInfo = new AttributeInfo();
@@ -576,9 +576,9 @@ private void writeAttributes(XmlSerializer writer,AttributeContainer obj) throws
 
     public void writeObjectBodyWithAttributes(XmlSerializer writer, KvmSerializable obj) throws IOException
     {
-        if(obj instanceof AttributeContainer)
+        if(obj instanceof HasAttributes)
         {
-            writeAttributes(writer, (AttributeContainer) obj);
+            writeAttributes(writer, (HasAttributes) obj);
         }
         writeObjectBody(writer, obj);
     }