Set < String > function ( ) { return group . getHeads ( ) ; }
returns the set of headers used to tag this group concode_field_sep Group<T> group concode_field_sep String getHeadValue concode_elem_sep int getSize concode_elem_sep LambdaList<Group<T>> subgroups concode_elem_sep LambdaList<T> find concode_elem_sep LambdaList<T> find concode_elem_sep LambdaGroup<T> findGroup concode_elem_sep LambdaGroup<T> findGroup concode_elem_sep Set<String> keySet concode_elem_sep LambdaList<T> findAll concode_elem_sep boolean isLeaf concode_elem_sep Object key concode_elem_sep T first