);
  }
  
  /* root:TAG -> The origin of the branch */
  if( memcmp(zTag, "root:", 5)==0 ){
    Stmt q;
    int rc;
    char *zBr;
    rid = symbolic_name_to_rid(zTag+5, zType);
    zBr = db_text("trunk","SELECT value FROM tagxref"
                          " WHERE rid=%d AND tagid=%d"
                          " AND tagtype>0",
                          rid, TAG_BRANCH);
    db_prepare(&q,
      "SELECT pid, EXISTS(SELECT 1 FROM tagxref"
                         " WHERE tagid=%d AND tagtype>0"
                         "   AND value=%Q AND rid=plink.pid)"
      "  FROM plink"
      " WHERE cid=:cid AND isprim",
      TAG_BRANCH, zBr
    );
    fossil_free(zBr);
    do{
      db_reset(&q);
      db_bind_int(&q, ":cid", rid);
      rc = db_step(&q);
      if( rc!=SQLITE_ROW ) break;
      rid = db_column_int(&q, 0);
    }while( db_column_int(&q, 1)==1 && rid>0 );