private void registerExtensions(@NonNull final Element cacheParent) {
        registerGsakExtensions(cacheParent);
        registerTerraCachingExtensions(cacheParent);
        registerCgeoExtensions(cacheParent);
        registerOpenCachingExtensions(cacheParent);
        registerGroundspeakExtensions(cacheParent);
    }
prefix of the long description. used for adding alternative geocodes.
main/src/main/java/cgeo/geocaching/files/GPXParser.java