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need
to represent and exchange structured
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data
on the web
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HTML
provides minimal structure (H1, H2,
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DIV,
P, SPAN, etc.)
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HTML
tag names have little meaning, so it’s
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hard
to exchange or automatically process
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data
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can’t
define your own new tag names in
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HTML
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XML
combines the power of SGML with
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the
simplicity of HTML
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