def get_unique_office_name(element=None):
    """Provide an autogenerated unique <office:name> for the document.
    """
    if element is not None:
        body = element.document_body
    else:
        body = None
    if body:
        used = body.get_office_names()
    else:
        used = []
    # unplugged current paragraph:
    if element is not None:
        used.extend(element.get_office_names())
    i = 1
    while True:
        name = '__Fieldmark__lpod_%s' % i
        if name in used:
            i += 1
            continue
        break
    return name