/**
* Add a key / value pair that is not part of the GPX schema as an extension.
*
* @param key the key
* @param value the value
*/
@Override
public void addExtension(String key, String value) {
if (!attr.containsKey(META_EXTENSIONS)) {
attr.put(META_EXTENSIONS, new Extensions());
}
Extensions ext = (Extensions) attr.get(META_EXTENSIONS);
ext.put(key, value);
}
