-int zebraExplain_lookupSU (ZebraExplainInfo zei, int set, int use);
-int zebraExplain_addSU (ZebraExplainInfo zei, int set, int use);
+int zebraExplain_add_attr_su(ZebraExplainInfo zei, int index_type,
+ int set, int use);
+
+/** \brief lookup ordinal from string index + index type
+ \param zei explain info
+ \param cat category
+ \param index_type index type
+ \param str index string
+ \returns -1 no such index+type exist; ordinal otherwise
+*/
+
+int zebraExplain_lookup_attr_str(ZebraExplainInfo zei,
+ zinfo_index_category_t cat,
+ int index_type,
+ const char *str);
+int zebraExplain_add_attr_str(ZebraExplainInfo zei,
+ zinfo_index_category_t cat,
+ int index_type,
+ const char *str);