# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

### O

out

  Parameter for returning results. Default is transfer full.

### T

transfer floating

  Alias for transfer none, used for objects with floating refs.

transfer full

  The caller owns the data, and is responsible for free it.

transfer none

  The data is owned by the callee, which is responsible of freeing it.