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1.While HTML possesses predefined and well-specified attributes, XML doesn’t. Document authors can set up their own XML words which are specific to their application/business requirements.
2. XML infixes the conception of regularness. The regularness rules of XML polish off certain ambiguity inbuilt in processing markup languages like HTML by implementing rules like mandating that all attribute values should be in quotes.
[edited by: coopster at 4:17 pm (utc) on April 24, 2009]