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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def render(self, staging=None):
 """ Renders the object to file, returning a list of created files. Calls validation code, and, as long as each child is also a subclass of :class:`HubComponent`, the rendering is recursive. """

        self.validate()
        created_files = OrderedDict()
        if staging is None:
            staging = tempfile.mkdtemp()
        this = self._render(staging)
        if this:
            created_files[repr(self)] = this
        for child in self.children:
            created_files[repr(child)] = child.render(staging)
        return created_files