Return absolute path for filename from local ``xslt/`` directory.

    Args:
        fn (str): Filename. ``MARC21slim2MODS3-4-NDK.xsl`` for example.

    Returns:
        str: Absolute path to `fn` in ``xslt`` dicretory..

def _absolute_template_path(fn):
    """
    Return absolute path for filename from local ``xslt/`` directory.

    Args:
        fn (str): Filename. ``MARC21slim2MODS3-4-NDK.xsl`` for example.

    Returns:
        str: Absolute path to `fn` in ``xslt`` dicretory..
    """
    return os.path.join(os.path.dirname(__file__), "xslt", fn)