This article was a bit easier for me. I have designed databases and I am very comfortable with data types, default values, acceptable ranges of values, formats, etc. For that reason, I can agree with the author's statement that XML schemas should supplant Document Type Definitions since schemas allow more definition. I am still unclear on the namespace concept though, so I am not sure why that is cited as a reason for schema over DTD.
I'll be interested to hear Dr. He talk about XML and making the concept more clear for me.
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