What makes XML more powerful than HTML?
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Not as much coding is needed
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Its ability to adapt to new uses
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The fact that its supported by all of the major software vendors
XML's extensibility - the ability to define custom tags and document structures - makes it more powerful than HTML. While HTML has a fixed set of tags, XML allows users to create their own tag sets tailored to specific applications. This adaptability enables XML to be used for countless data representation purposes beyond web pages.
XML's power over HTML comes from being an extensible, self-describing markup language — you define your own tags and structure to represent any kind of data, rather than being limited to HTML's fixed, presentation-oriented tag set. That adaptability to new uses (data interchange, config, documents, etc.) is XML's core advantage. It's not about needing less code (XML is often more verbose) or vendor support (HTML has broader/older support), so those options don't capture what actually makes XML more powerful.