SGML vs. XML vs. HTML

• HTML SGML XML

• Extensibility: new tag ? Yes/No Yes Yes

• Structure: deep nested ? No Yes Yes

• Validation: structural validity ? No Yes Yes

• DTD is required for parsing ? No Yes Opt.

• Browser dependency ? High Low Low

• Cost/Benefit ? Good Poor Med

• When were you born ? ‘92 ‘86 ‘98

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