private void checkAreaTags(Token token) {
		int count = 0;

		for (Object tag : token.getTags()) {
			if (tag instanceof AreaTag) {
				count += 1;
			}
		}

		if (count == 0) {
			errorMessages.add("Line " + token.getStart().getLinenumber() + ": "
					+ token + " misses area identification.");

		} else if (count > 1) {
			errorMessages.add("Line " + token.getStart().getLinenumber() + ": "
					+ token + " has conflicting area identification.");
		}
	}