YAZ_CHECK(compare(ct, "@and @and a b @and c d", "(a and b) and (c and d)"));
YAZ_CHECK(compare(ct, "@attr 1=field abc", "field=abc"));
YAZ_CHECK(compare(ct, "@and @and a b @and c d", "(a and b) and (c and d)"));
YAZ_CHECK(compare(ct, "@attr 1=field abc", "field=abc"));