default void addToSql(final SqlBuilder sqlBuilder) {
        //Filters may be used in all combinations of AND and OR statements
        //Thus in case filters do not provide their own WHERE filter, we MUST provide a statement always evaluating to TRUE (resp. returning lines)
        //Otherwise caches might falsely be filtered out esp. in OR-statements
        //Example:
        //  If user wants to filter caches starting with A OR caches being of type "multi" and second filter would NOT provide any SQL-where
        //  then this MUST falsely result in sst like "SELECT * from caches WHERE name like 'A%' OR 1=1" rather than "SELECT * from caches WHERE name like 'A%'"
        sqlBuilder.addWhereAlwaysInclude();
    }
For efficient selection of geocaches from DB passing this filter, filter classes shall implement this method
main/src/main/java/cgeo/geocaching/filters/core/IGeocacheFilter.java