public @interface Internal
Program elements annotated @Internal are intended for
POI internal use only.
Such elements are not public by design and likely to be removed, have their
signature change, or have their access level decreased from public to
protected, package, or private in future versions of POI without notice.
@Internal elements are eligible for immediate modification or removal and are
not subject to the POI project policy of deprecating an element for 2 major
releases before removing.
The POI version when an element was declared internal.
This is not the same as an @since javadoc annotation
which specifies when the feature itself was added.
A feature that was made internal after it was added may
have a different since and Internal-since version numbers.