Examples of Design patterns in Oggdsf
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Builder Pattern 	- Used in WinCMMLParser. This builds up the tag objects(libCMMLTags) via
				MSXML.
Prototype Pattern	- Used in libCMMLTags to provide "virtual constructors" to allow a
				pointer to the base type (prototype) to clone the actual concrete
				instance of itself.
Adapter Pattern		- Used in the .NET libraries to expose unmanaged code components.
Ambassador Pattern	- Used in the callback proxy classes (eg. CMMLCallbackProxy) to proxy a callback
			  	from unmanaged code through to managed code.
Abstract Factory Pattern- Used in the OggStreamFactory and DataSourceFactory, to create
				various concrete ogg streams or data sources (file, http etc)
Facade Pattern		- Used to hide complexity of directshow from .NET managed clients (DSPlay)
Template Method Pattern - used in all the AbstractAudioDecoder etc classes allowing hooks to derived
				classes to provide their own codec specific algorithms.
Command Pattern		- Used in the StreamMappers. The client issues requests to the StreamMapper
				which executes the request on the appropriate object (ie acceptOggPage)