this.ancestors = ancestors;
this.field = new Array();
for (k in fieldsdescr) {
this.field[k] = fieldsdescr[k];
if (this.field[k].type == 'fields') {
this.ancestors = ancestors;
this.field = new Array();
for (k in fieldsdescr) {
this.field[k] = fieldsdescr[k];
if (this.field[k].type == 'fields') {