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A valid XML document will reference a document
type declaration (DTD) : <!DOCTYPE cookBook SYSTEM "cookbook.dtd">
A
DTD specifies:
- names for all your elements
- names and
default values for their attributes
- rules about how elements can
nest
- names for re-usable pieces of data
(entities)
- and a few other things
n.b. A DTD
doesnot specify anything about what elements "mean"
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