Transcription: In effect, what you're able to do is break up your document type definition into multiple external files, which of course are called what? Entities. So you create these multiple external entities that contain your document type definition and then within your internal subset you can reference them. This is exactly the same as creating multiple XML documents and then referencing them from say a master XML document and getting a single logical entity. We have an example of this. Let's go ahead and take a look at it.
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