# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

### E

element-type

  Generics and defining elements of containers and arrays.

### O

out

  Parameter for returning results. Default is transfer full.

### T

transfer container

  The caller owns the data container, but not the data inside it.

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.