Simple Outline XML (SOX) is a compressed way of writing XML.
SOX uses indenting to represent the structure of an XML document, eliminating the need for closing tags.
Example
The following XHTML markup fragment:
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Sample page</title> </head> <body> <p>A very brief page</p> </body> </html>
... would appear in SOX as:
html> xmlns=http://www.w3.org/1999/xhtml head> title> Sample page body> p> A very brief page
SOX can be readily converted to XML.
See also Haml is a meta-XHTML representation, originally implemented for Ruby and has a similar mark-up structure.
Sources Archive.org: Simple Outline XML: SOX Archive.org: IBM Developer Works > XML > XML Watch: Exploring alternative syntaxes for XML, Weighing the pros and cons