Within the cdata marked section, parsing is switched off, so
that angle brackets, <, and ampersands, &, are no
longer recognised as introducing markup and entity references.
You will typically use a CDATA marked section to delimit
verbatim text. The code and verbatim elements (see
Appendix C.1.13 and Appendix C.1.78) do not make any
provision to switch off parsing of the text within them. If the text
would be significant to the parser - that is, if it contains angle
brackets or ampersands - you must either escape those characters by
giving them as entity references < or &,
or else enclose the contents in a CDATA marked section as
follows.
Within a CDATA marked section, no markup is recognised except the<verbatim><![ CDATA [ Here is some <em>marked-up</em> text which will be skipped & ignored ]]></verbatim>
]]> which closes the marked section; thus element
start- and end-tags are not parsed, and entity references not expanded.