gical code and comments. Both nested namespaces and metalevels are specified by prefixes. The IFF <a href="http://suo.ieee.org/IFF/grammar.pdf">grammar</a> which specifies the syntax of the IFF language, is written in <a href="http://en.wikipedia.org/wiki/Extended_Backus_Naur_Form">Extended Backus Naur Form (EBNF)</a>.</p>

<table class="math">
<tr"><th>&nbsp;&nbsp;&nbsp;</th><th>&nbsp;</th><th align="right"><span style="font-family: helvetica,arial,sans-serif; font-weight: lighter; font-size: large;">Math<