# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

### D

default

  Default parameter value (in case a function which shadows this one via rename-to has fewer parameters).

### E

element-type

  Generics and defining elements of containers and arrays.

### O

out

  Parameter for returning results. Default is transfer full.

### S

Stable

  The intention of a Stable interface is to enable arbitrary third parties to develop applications to these interfaces, release them, and have confidence that they will run on all minor releases of the product (after the one in which the interface was introduced, and within the same major release). Even at a major release, incompatible changes are expected to be rare, and to have strong justifications.

### 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.