code: public void setAttributeValue(String attributeName, String value) {
  
          m_entityAttributes.remove(attributeName);
          List<String> values = new ArrayList<String>();
          values.add(value);
          m_simpleAttributes.put(attributeName, values);
          fireChange();
      }
docs: Sets the given attribute value. Will remove all previous attribute values.<p>
  
  @param attributeName the attribute name
  @param value the attribute value