Defines the interface for an input method that supports complex text input.
Input methods traditionally support text input for languages that have
more characters than can be represented on a standard-size keyboard,
such as Chinese, Japanese, and Korean. However, they may also be used to
support phonetic text input for English or character reordering for Thai.

Subclasses of InputMethod can be loaded by the input method framework; they
can then be selected either through the API
(InputContext.selectInputMethod)
or the user interface (the input method selection menu).

Provides methods that input methods
can use to communicate with their client components or to request
other services.  This interface is implemented by the input method
framework, and input methods call its methods on the instance they
receive through
InputMethod.setInputMethodContext(java.awt.im.spi.InputMethodContext).
There should be no other implementors or callers.

Defines methods that provide sufficient information about an input method
to enable selection and loading of that input method.
The input method itself is only loaded when it is actually used.