Represents a place annotated with a given annotation. If a place has
multiple annotations, it can be represented by multiple
mozIAnnotatedResult(s).
The globally unique identifier of the place with this annotation.
@note if itemId is valid this is the guid of the bookmark, otherwise
of the page.
The URI of the place with this annotation, if available, null otherwise.
The bookmark id of the place with this annotation, if available,
-1 otherwise.
@note if itemId is -1, it doesn’t mean the page is not bookmarked, just
that this annotation is relative to the page, not to the bookmark.
Name of the annotation.
Value of the annotation.