Content of these tags is treated as raw text
An end tag must not specified for void elements.
An end tag must not specified for void elements. List of elements taken from http://www.w3.org/TR/html-markup/syntax.html#syntax-elements
< and > do not need to be escaped
" and ' may be represented by " or ', but this is not compulsory
scala.xml.Utility.escape()
From http://hohonuuli.blogspot.com/2012/10/simple-hex-string-to-ascii-function-for.html