ch = zebraExplain_lookup_attr_str(zei, cat, p->index_type, p->index_name);
if (ch < 0)
ch = zebraExplain_add_attr_str(zei, cat, p->index_type, p->index_name);
ch = zebraExplain_lookup_attr_str(zei, cat, p->index_type, p->index_name);
if (ch < 0)
ch = zebraExplain_add_attr_str(zei, cat, p->index_type, p->index_name);