SOX - Simple Outline XML
https://en.wikipedia.org/wiki/Simple_Outline_XML

writing:
html>
    xmlns=http://www.w3.org/1999/xhtml
    head>
        title> Sample page
    body>
        p> A very brief page
	
results in:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Sample page</title>
</head>
<body>
  <p>A very brief page</p>
</body>
</html>


HAML - a compact form of XML/HTML
https://en.wikipedia.org/wiki/Haml

writing:
%p{:class => "sample", :id => "welcome"} Hello, World!
- or -
%p.sample#welcome Hello, World!

results in:
<p class="sample" id="welcome">Hello, World!</p>

