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... some companies are even going further and using Extensible Markup Language (XML) to improve search technology. XML is able to index and place tags, or short descriptors, next to textual information so that machines can better determine the nature of that text.
Many experts consider XML important for improving the world of search engines. XML, like HTML, makes use of tags, but while HTML specifies what each tag means, XML uses tags to add context to the data.
XYZFind returns actual content aggregated from all matching documents, not just links to documents This could give rise to some really complicated copyright issues, if provided as an online service.