Transcription: As you've learned, using document type definitions, you can go in and you can create very structured documents. You can control the content that is put inside your document and make sure that it adheres to the structure that you've defined. Now, granted, it's not the same as, say, a relational database structure where you have complete control and it's very rigid. You can be very rigid inside of an XML document, but it doesn't have a lot of the capabilities of a relational database like primary foreign key relationships and data integrity and things like that. There aren't any triggers, for ex ...
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