def render_children(self, block, view_name=None, context=None):
        """Render a block's children, returning a list of results.

        Each child of `block` will be rendered, just as :func:`render_child` does.

        Returns a list of values, each as provided by :func:`render`.

        """
        results = []
        for child_id in block.children:
            child = self.get_block(child_id)
            result = self.render_child(child, view_name, context)
            results.append(result)
        return results