Parses <ChildInstance>

        @param node: Node containing the <ChildInstance> element
        @type node: xml.etree.Element

def parse_child_instance(self, node):
        """
        Parses <ChildInstance>

        @param node: Node containing the <ChildInstance> element
        @type node: xml.etree.Element
        """

        if 'component' in node.lattrib:
            component = node.lattrib['component']
        else:
            self.raise_error('<ChildInstance> must specify a component reference')

        self.current_structure.add_child_instance(ChildInstance(component))