| Interface | Description | 
|---|---|
| AttributeExtensible | Classes that implement this interface can contain extensibility
 attributes. | 
| ElementExtensible | Classes that implement this interface can contain extensibility
 elements. | 
| ExtensibilityElement | This interface should be implemented by classes intending to represent
 extensions. | 
| ExtensionDeserializer | This interface should be implemented by classes which deserialize
 org.w3c.dom.Elements into extension-specific instances of
 ExtensibilityElement. | 
| ExtensionSerializer | This interface should be implemented by classes which serialize
 extension-specific instances of ExtensibilityElement into the
 PrintWriter. | 
| Class | Description | 
|---|---|
| ExtensionRegistry | This class is used to associate serializers, deserializers, and
 Java implementation types with extensibility elements. | 
| UnknownExtensibilityElement | This class is used to wrap arbitrary elements. | 
| UnknownExtensionDeserializer | This class is used to deserialize arbitrary elements into
 UnknownExtensibilityElement instances. | 
| UnknownExtensionSerializer | This class is used to serialize UnknownExtensibilityElement instances
 into the PrintWriter. | 
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