Save this target execution context into an xml.dom.Element
        object.

def save_xml(self, doc, element):
        '''Save this target execution context into an xml.dom.Element
        object.

        '''
        super(TargetExecutionContext, self).save_xml(doc, element)
        element.setAttributeNS(RTS_NS, RTS_NS_S + 'id', self.id)