In the 1.5.0 schema, <token_array> has been added, but hasn't also been included in the specification file.
// from schema:
The accessor element declares an access pattern to one of the array elements: float_array,int_array, Name_array, bool_array, token_array, and IDREF_array.
// from specification:
The <accessor> element declares an access pattern into one of the array elements <float_array>, <int_array>, <Name_array>, <bool_array>, and <IDREF_array> or into an external array source.