EXPORT void a_initialize_extension(void *xa)
{ 
 ...
 // Index property - Index Key generator
  mexima_run_amosql("add_Index_key_generator('MBTREE', 'Number', 'select uniform_int(1000, 0, 1000)');");

  // Index property - SSF translation rules for MBTREE 
  mexima_run_amosql("add_SSF_trans_rule('MBTREE', 1, #'Null', {#'>=', #'<='}, #'MBTREE_SELECT_RANGE', 0);");
  mexima_run_amosql("add_SSF_trans_rule('MBTREE', 2, #'Null', {#'<='}, #'MBTREE_SELECT_RANGE', 0);");
  mexima_run_amosql("add_SSF_trans_rule('MBTREE', 3, #'Null', {#'>='}, #'MBTREE_SELECT_RANGE', 0);");
  
  // Index property - SSF parameter generator   
  mexima_run_amosql("add_SSF_para_generator('MBTREE', #'MBTREE_SELECT_RANGE',  \
	                                'select l, u from Number l, Number u       \
									 where  l in uniform_int(100, 0, 1000) and \
									 u in uniform_int(100, 0, 1000)', '(Number, Number)');");
  
}