Transcription: This ability to use external entities makes XML very powerful because what you can do is you can create a document that references other documents and treats them as if they were one logical entity. We're going to talk about that in a moment, logical storage versus physical storage, logical structure versus physical structure. But while this is a great benefit, it can also be a great curse. You need to be very careful. And I'm going to throw this warning out there now, even before we get into it very deeply. Don't go crazy. referencing external entities because what can happen is as you refere ...
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