Selling on Amazon Guide to XML
XML (Extensible Markup Language) is a markup language for documents containing structured information. It defines a generic syntax used to mark up data with simple, human-readable tags. Data is included in XML documents as strings of text. The data is surrounded by text markup that describes the data. XML's basic unit of data and markup is called an element. The markup in an XML document looks a lot like the markup in an HTML (Hypertext Markup Language) document, but there are some crucial differences. Most importantly, XML is a Meta markup language. This means that it does not have a fixed set of tags and elements that are meant to work for everybody.