Parse an xml.dom Node object representing an execution context into
        this object.

def parse_xml_node(self, node):
        '''Parse an xml.dom Node object representing an execution context into
        this object.

        '''
        self.id = node.getAttributeNS(RTS_NS, 'id')
        self.kind = node.getAttributeNS(RTS_NS, 'kind')
        if node.hasAttributeNS(RTS_NS, 'rate'):
            self.rate = float(node.getAttributeNS(RTS_NS, 'rate'))
        else:
            self.rate = 0.0
        self._participants = []
        for c in node.getElementsByTagNameNS(RTS_NS, 'Participants'):
            self._participants.append(TargetComponent().parse_xml_node(c))
        for c in get_direct_child_elements_xml(node, prefix=RTS_EXT_NS,
                                               local_name='Properties'):
            name, value = parse_properties_xml(c)
            self._properties[name] = value
        return self