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[Ed Shaya]

 From page 39 of What's New in IDL (from RSI).
http://www.rsinc.com/idl/pdfs/whatsnew_61_manual.pdf

New XML DOM Object Classes
IDL 6.1 supports reading, querying and writing XML files through a DOM 
(Document Object Model) interface. XML is eXtensible Markup Language, a 
popular storage standard used in sharing data across networks and the 
web. Support for reading XML through a SAX (Simple API for XML) 
interface was added in IDL 5.6. SAX can be preferable when parsing large 
files, while DOM allows complete file browsing and writing capabilities.
For more information on the new IDL object classes that provide access 
to an XML document via its document object model (DOM) see “IDLffXMLDOM 
Classes” in the IDL Reference Guide manual.

Since so many astronomers use IDL, this is an important advance.
Ed