private XmlElement CreateAssociatedPropertyElement(XmlElement modelElement,XmlElement lifelineElement,XmlElement classElement)
        {
            XmlElement createdPropertyElement;
            string lifelineName=lifelineElement.GetAttribute(UmlModel.NAME_ATTR_NAME);
            string lifelineObjectName=GetLifelineObjectName(lifelineName);
            string lifelineTypeName=GetLifelineTypeName(lifelineName);

            PropertyElementCreator elementCreator=new PropertyElementCreator(this.XmiDocument,this.XmiDocumentBuilder);
            createdPropertyElement=elementCreator.CreatePropertyElement(modelElement,lifelineObjectName,classElement);
            return createdPropertyElement;
        }