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Case 12-1
Casey is using XML to store information about the students in the science classes that he teaches. He wants to design a DTD that he can use to validate the XML documents that he uses for this purpose, and he comes to you for help.
-After you teach Casey about declarations for elements with child elements, he constructs the element declaration <!ELEMENT class ((seminar | lesson | workshop) , time?) >.Given this declaration, which of the following is NOT a valid "class" element?
Invoice
A document from a seller requesting payment from the buyer; the supplier’s bill.
Mexican Peso
The currency of Mexico, symbolized as MXN, and used in financial transactions within the country.
U.S. Dollars
The official currency of the United States, widely used in international transactions.
Currency Exchange Rates
The rate at which one currency can be exchanged for another.
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