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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 visit_reference(self, node: docutils.nodes.reference) -> None: """Called for "reference" nodes."""

        # if len(node.children) != 1 or not isinstance(node.children[0], docutils.nodes.Text) \
        #         or not all(_ in node.attributes for _ in ('name', 'refuri')):
        #     return
        path = pathlib.Path(node.attributes['refuri'])
        try:
            if path.is_absolute():
                return
            resolved_path = path.resolve()
        except FileNotFoundError:  # in resolve(), prior to Python 3.6
            return
        # except OSError:  # in is_absolute() and resolve(), on URLs in Windows
        #     return
        try:
            resolved_path.relative_to(HERE)
        except ValueError:
            return
        if not path.is_file():
            return
        assert node.attributes['name'] == node.children[0].astext()
        self.references.append(node)