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Different
organizations will define their own
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DTDs
for various purposes.
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You
may wish to mix elements from more
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than
one DTD in a single document.
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XML
Namespaces Recommendation makes
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this
possible.
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For
example, you can use HTML elements
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within
an XML file.
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Element
names are given a prefix indicating
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which
application (namespace) they came
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from.
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