The Web is evolving into a web of data or Semantic Web. Data will be encoded by Semantic Web languages like RDF or OWL according to many experts' visions. So, it is not difficult to envision data feeds will be also in the form of RDF or OWL. A big advantage of providing semantic data feeds, i.e. feeding data in Semantic Web standards, is that the data can then be readily consumed and reused by other computers.
CSV datafeeds are mostly being used within the affiliate marketing. Affiliate or so called publisher websites load the CSV file to load product information from online webshops. This way it is a lot easier to load thousands of product to the website. CSV is not like XML and is not as semantic but it does have a good basic structure. This file format can easily be created and loaded with any spreadsheet program like Excel.
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