int operator()(keyword_item const & a, keyword_item const & b) const {
// we use the ascii version, because in turkish, 'i'
// is not the lowercase version of 'I', and thus
int operator()(keyword_item const & a, keyword_item const & b) const {
// we use the ascii version, because in turkish, 'i'
// is not the lowercase version of 'I', and thus