# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

### N

nullable

  NULL may be passed as the value in, out, in-out; or as a return value.

### S

scope call

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

### T

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.