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Extensible Markup Language is a metalanguage that enables definiton of customized markup languages.

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Wikipedia article: xml

XML is both human and machine readable. That said, most humans will take a look at it and want to close their eyes – but with a little bit of knowledge about extensible markup language it’s possible to interpret relatively easily.

Here is a sample of xml in this case used for OPML (Outline Processor Markup Language). “OPML is an XML format for outlines (defined as "a tree, where each node contains a set of named attributes with string values.” – Wikipedia OPML

   1:  <?xml version="1.0" encoding="UTF-8"?>
   2:  <opml version="1.0">
   3:   <head>
   4:    <title>Feeds</title>
   5:   </head>
   6:   <body>
   7:     <outline title="Ballarat Library Chick" type="RSS" xmlURL="http://ballaratlibrarychick.blogspot.com/feeds/posts/default?alt=rss" htmlURL="http://ballaratlibrarychick.blogspot.com.au/" />
   8:     <outline title="When the moon shines" type="rss" xmlUrl="http://whenthemoonshines.com/feed/" htmlUrl="http://whenthemoonshines.com"/>
   9:   </outline>
  10:   </body>
  11:  </opml>



OPML is used to migrate a list of RSS feeds from one feed reader to another. This sample is a cut down version of the OPML file I created of all the #blogjune rss feeds.

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