private static boolean isItDefinitelyShapeId(String identifier) {
        for (int i = 0; i < identifier.length(); i++) {
            char c = identifier.charAt(i);
            if (c == '.' || c == '$' || c == '#') {
                return true;
            }
        }
        return false;
    }
Parses a single trait: "@" trait-id [(trait-body)].

@param loader   IDL parser.
@return Returns the parsed trait.
smithy-model/src/main/java/software/amazon/smithy/model/loader/IdlTraitParser.java