def METHOD_NAME(image_obj):
    '''Return document related SPDX tag-values'''
    block = spdx_formats.spdx_version + '\n'
    block = block + spdx_formats.data_license + '\n'
    block = block + spdx_formats.spdx_id + '\n'
    block = block + spdx_formats.document_name.format(
        image_name=image_obj.name) + '\n'
    block = block + get_document_namespace(image_obj) + '\n'
    block = block + spdx_formats.license_list_version + '\n'
    block = block + spdx_formats.creator.format(
        version=get_git_rev_or_version()[1]) + '\n'
    block = block + spdx_formats.created.format(
        timestamp=datetime.datetime.utcnow().strftime(
            "%Y-%m-%dT%H:%M:%SZ")) + '\n'
    block = block + spdx_formats.document_comment + '\n'
    return block