id_first          890 lib/pacemaker/pcmk_sched_ordering.c     const char *id_first = NULL;
id_first          911 lib/pacemaker/pcmk_sched_ordering.c     id_first = crm_element_value(xml_obj, XML_ORDER_ATTR_FIRST);
id_first          913 lib/pacemaker/pcmk_sched_ordering.c     if ((id_first == NULL) || (id_then == NULL)) {
id_first          917 lib/pacemaker/pcmk_sched_ordering.c     if (!pcmk__valid_resource_or_tag(data_set, id_first, &rsc_first,
id_first          920 lib/pacemaker/pcmk_sched_ordering.c                          "valid resource or tag", ID(xml_obj), id_first);