The DOMImplementation
interface could be considered the highest level
interface in the DOM. It exposes the hasFeature( ) method, which allows a programmer using a given DOM
implementation to detect if specific features are available. In DOM
Level 2, it introduced facilities for creating new DocumentType nodes, which can then be used
to create new Document
instances.
The only method added to the DOMImplementation interface for Level 3 was
the getFeature( ) method. This method allows DOM implementers to provide
access to extended functionality, which is not part of the DOM
specification itself, through the use of extension objects. These
objects implement the DOMObject interface,
which generally maps to the generic object (e.g., the Java Object) type in the underlying programming
language (if the language is object-oriented).Table 19-15 describes the
DomImplementation interface.
