+ void *(*begin)(struct zebra_register *reg,
+ void *class_handle, RSET rset, NMEM nmem,
+ TERMID *terms, int numterms);
+ /* ### Could add parameters to begin:
+ * char *index; // author, title, etc.
+ * int dbsize; // number of records in database
+ * int rssize; // number of records in result set (estimate?)
+ */