protected static String validate(final String input) {
        if ("nil".equalsIgnoreCase(input)) {
            return "";
        }
        return input.trim();
    }
GPX 1.0 and 1.1 use different XML elements to put the cache into, therefore needs to be overwritten in the
version specific subclasses
main/src/main/java/cgeo/geocaching/files/GPXParser.java