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There’s nothing new about expressing XML in a significant-indentation format. Here’s Slim next to one from 2001.

Simple Outline XML (2001)

html>
    head>
        title> My Home Page
    body>
        h1> Contact Details
        p>  I can be contacted at
            a>  href=mailto:me@myplace.net 
                this address
            except when on vacation.

Wikipedia Article

Slim (2010)

html
  head
    title My Home Page
  body
    h1 Contact Details
    p I can be contacted at
      a href="mailto:me@myplace.net" this address
      except when on vacation.

They’re quite similar. I find Slim a bit more comfortable in a ruby environment because it’s a bit more terse and uses two spaces like Ruby code does. It also is a templating language too. (In fact, I’m not sure there are converters going in both directions between XML/HTML and non-templated Slim. It could make a nice addition.)