Subclasses of this class can be registered using the static variable registeredExtensions. The registration process associates the new subclass with a given qualified name (ie. element name and namespace). This information will be used by {@link Packet#getExtension(String,String)} for locating the corresponding PacketExtensionsubclass to return for the requested qualified name. Each PacketExtension must have a public constructor that takes an Element instance as an argument. @author Gaston Dombiak
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