How to use the datacite.schema40 function in datacite

def test_datacite_build_metadata(self, registration, datacite_client):
        metadata_xml = datacite_client.build_metadata(registration).encode('utf-8')
        parser = lxml.etree.XMLParser(ns_clean=True, recover=True, encoding='utf-8')
        root = lxml.etree.fromstring(metadata_xml, parser=parser)
        xsi_location = '{http://www.w3.org/2001/XMLSchema-instance}schemaLocation'
        expected_location = 'http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4/metadata.xsd'
        assert root.attrib[xsi_location] == expected_location

        identifier = root.find('{%s}identifier' % schema40.ns[None])
        assert identifier.attrib['identifierType'] == 'DOI'
        assert identifier.text == settings.DOI_FORMAT.format(prefix=settings.DATACITE_PREFIX, guid=registration._id)

        creators = root.find('{%s}creators' % schema40.ns[None])
        assert len(creators.getchildren()) == len(registration.visible_contributors)

        publisher = root.find('{%s}publisher' % schema40.ns[None])
        assert publisher.text == 'Open Science Framework'

        pub_year = root.find('{%s}publicationYear' % schema40.ns[None])
        assert pub_year.text == str(registration.registered_date.year)

        resource_type = root.find('{%s}resourceType' % schema40.ns[None])
        assert resource_type.text == 'Project'
        assert resource_type.attrib['resourceTypeGeneral'] == 'Text'

assert root.attrib[xsi_location] == expected_location

        identifier = root.find('{%s}identifier' % schema40.ns[None])
        assert identifier.attrib['identifierType'] == 'DOI'
        assert identifier.text == settings.DOI_FORMAT.format(prefix=settings.DATACITE_PREFIX, guid=registration._id)

        creators = root.find('{%s}creators' % schema40.ns[None])
        assert len(creators.getchildren()) == len(registration.visible_contributors)

        publisher = root.find('{%s}publisher' % schema40.ns[None])
        assert publisher.text == 'Open Science Framework'

        pub_year = root.find('{%s}publicationYear' % schema40.ns[None])
        assert pub_year.text == str(registration.registered_date.year)

        resource_type = root.find('{%s}resourceType' % schema40.ns[None])
        assert resource_type.text == 'Project'
        assert resource_type.attrib['resourceTypeGeneral'] == 'Text'

data['descriptions'] = [{
                'descriptionType': 'Abstract',
                'description': node.description
            }]

        if node.node_license:
            data['rightsList'] = [{
                'rights': node.node_license.name,
                'rightsURI': node.node_license.url
            }]

        # Validate dictionary
        assert schema40.validate(data)

        # Generate DataCite XML from dictionary.
        return schema40.tostring(data)

def serialize_xml(cls, record):
        data = json.loads(cls.serialize_json(record))
        return schema40.tostring(data)

data['descriptions'] = [{
                'descriptionType': 'Abstract',
                'description': node.description
            }]

        if node.node_license:
            data['rightsList'] = [{
                'rights': node.node_license.name,
                'rightsURI': node.node_license.url
            }]

        # Validate dictionary
        assert schema40.validate(data)

        # Generate DataCite XML from dictionary.
        return schema40.tostring(data)

}

        if node.description:
            data['descriptions'] = [{
                'descriptionType': 'Abstract',
                'description': node.description
            }]

        if node.node_license:
            data['rightsList'] = [{
                'rights': node.node_license.name,
                'rightsURI': node.node_license.url
            }]

        # Validate dictionary
        assert schema40.validate(data)

        # Generate DataCite XML from dictionary.
        return schema40.tostring(data)

}

        if node.description:
            data['descriptions'] = [{
                'descriptionType': 'Abstract',
                'description': node.description
            }]

        if node.node_license:
            data['rightsList'] = [{
                'rights': node.node_license.name,
                'rightsURI': node.node_license.url
            }]

        # Validate dictionary
        assert schema40.validate(data)

        # Generate DataCite XML from dictionary.
        return schema40.tostring(data)