I believe XML will be everywhere, but largely hidden in the plumbing of the data center of the future. Every place where data is in motion will most probably have an XML dimension to it. Data moving from database tier to business logic tier, data moving from business logic tier to presentation tier, data flowing between systems over SOA's and so on. Also, an increasing number of applications will use XML as their primary storage notation for example OpenOffice's use of XML in zip files for storage. There will continue to be notations that are not XML based of course, most notably in non-text application areas such as audio, video. However, even here, I think we will see a significant amount of XML 'islands' sprinkled in the data for metadata applications.
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