How to use the elementpath.datatypes.GregorianYear10 function in elementpath

'name': XSD_DATETIME,
        'python_type': (unicode_type, str, datatypes.DateTime10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.DateTime10.fromstring,
    },  # [-][Y*]YYYY-MM-DD[Thh:mm:ss]
    {
        'name': XSD_DATE,
        'python_type': (unicode_type, str, datatypes.Date10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.Date10.fromstring,
    },  # [-][Y*]YYYY-MM-DD
    {
        'name': XSD_GYEAR,
        'python_type': (unicode_type, str, datatypes.GregorianYear10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.GregorianYear10.fromstring,
    },  # [-][Y*]YYYY
    {
        'name': XSD_GYEAR_MONTH,
        'python_type': (unicode_type, str, datatypes.GregorianYearMonth10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.GregorianYearMonth10.fromstring,
    },  # [-][Y*]YYYY-MM
)

XSD_11_BUILTIN_TYPES = XSD_COMMON_BUILTIN_TYPES + (
    # --- Year related primitive types (year 0 allowed and mapped to 1 BCE) ---
    {

'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.DateTime10.fromstring,
    },  # [-][Y*]YYYY-MM-DD[Thh:mm:ss]
    {
        'name': XSD_DATE,
        'python_type': (unicode_type, str, datatypes.Date10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.Date10.fromstring,
    },  # [-][Y*]YYYY-MM-DD
    {
        'name': XSD_GYEAR,
        'python_type': (unicode_type, str, datatypes.GregorianYear10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.GregorianYear10.fromstring,
    },  # [-][Y*]YYYY
    {
        'name': XSD_GYEAR_MONTH,
        'python_type': (unicode_type, str, datatypes.GregorianYearMonth10),
        'admitted_facets': DATETIME_FACETS,
        'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
        'to_python': datatypes.GregorianYearMonth10.fromstring,
    },  # [-][Y*]YYYY-MM
)

XSD_11_BUILTIN_TYPES = XSD_COMMON_BUILTIN_TYPES + (
    # --- Year related primitive types (year 0 allowed and mapped to 1 BCE) ---
    {
        'name': XSD_DATETIME,
        'python_type': (unicode_type, str, datatypes.DateTime),
        'admitted_facets': DATETIME_FACETS,