@Override
    public String toString() {
        if (programName != null) {
            return programName + ":L" + lineNumber + ":" + characterOffset;
        } else {
            return "L" + lineNumber + ":" + characterOffset;
        }
    }
A pointer to a location in a YQL source program.
container-search/src/main/java/com/yahoo/search/yql/Location.java