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- - (hyphen)
- ? (question mark)
- : (colon)
- ( (open bracket)
- ) (close bracket)
- . (full stop, period, or decimal point)
- , (comma)
- ’ (apostrophe)
- = (double hyphen or equal sign)
- / (oblique)
- + (plus sign)
- < (carriage return)
- ≡ (line feed)
- (space)
Restrictions on the character set are already embedded in the AIXM schema for elements such as names, identifiers, etc. For AIXM elements of type annotation, instructions, etc. that are allowed by the AIXM Schema to use any Unicode character it is important that Digital NOTAM applications limit the character set that can be used to the one mentioned above.
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