Transcription: As you can see, internal entities are very powerful. You can create them, define them, specify their names, specify their contents, then use them throughout the content of your document. And they have to be declared within a document type definition. We're going to stop with the document type definition right here because as we progress, you're going to see that the DTD is extremely important and in fact is really one of the most powerful features of XML. But we're going to get into content modeling in the next section. For now, let's talk about some more markup tags, markup characteristics th ...
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