# 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.

### S

scope call

  The callback is valid only during the call to the method.

### T

transfer full

  Free data after the code is done.

transfer none

  Don't free data after the code is done.