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Allegro CL |
ANSI Common Lisp 13 Characters 13.1 Character Concepts
13.1.6 Ordering of CharactersThe total ordering on characters is guaranteed to have the following properties:
Of the standard characters, those which are alphanumeric obey the following partial ordering:
A<B<C<D<E<F<G<H<I<J<K<L<M<N<O<P<Q<R<S<T<U<V<W<X<Y<Z a<b<c<d<e<f<g<h<i<j<k<l<m<n<o<p<q<r<s<t<u<v<w<x<y<z 0<1<2<3<4<5<6<7<8<9 either 9<A or Z<0 either 9<a or z<0This implies that, for standard characters, alphabetic1 ordering holds within each case (uppercase and lowercase), and that the numeric characters as a group are not interleaved with alphabetic characters. However, the ordering or possible interleaving of uppercase characters and lowercase characters is implementation-defined. |