Layout/design program by Adobe.

InDesign is a desktop publishing program made by Adobe Systems. It is specifically versatile for layout design, and is used to create magazine, book, newsletter, and poster layouts.

http://www.adobe.com/products/indesign/

With CS4, InDesign files can be represented using IDML, an XML document type. Which can be gotten to via an XML transform, as here:

http://thinkubator.ccsp.sfu.ca/wikis/xmlProduction