The subsequent characters and symbols are permissible for the purpose of defining keyword entries, which encompass both their usage and the content associated with them:
A a | B b | C c | D d | E e | F f | G g | H h | I i | J j |
K k | L l | M m | N n | O o | P p | Q q | R r | S s | T t |
U u | V v | W w | X x | Y y | Z z | ||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| - | _ | / | # | * | + | @ | & | ' | ç |
| à | â | è | é | ê | î | ô | û | ß | |
Ä ä | Ö ö | Ü ü | Å å | Æ æ |