- public abstract double x();
- public abstract double y(int index);
- public abstract int id(int index);
- public abstract String id_name(int index);
+ public abstract double x() throws AltosUIDataMissing;
+ public abstract double y(int index) throws AltosUIDataMissing;
+ public abstract int id(int index) throws AltosUIDataMissing;
+ public abstract String id_name(int index) throws AltosUIDataMissing;