Heaven or XM-hell? "No one intended for our XML data to grow unwieldy over the past few years, but it did. It takes a lot of hard work and attention to maintain the semantic integrity of the data represented in your XML, as your business morphs and changes and new people come along to touch and manipulate the data in different ways. It’s particularly difficult when you’re converting data created by people, ensconced in the daily ebb and flow of messy human life, into a machine-readable format intended for the ages."
As mentioned by Jon Udell