* Don't use regular HTML tags except for <code><b></code>, <code><i></code>, <code><tt></code>, <code><nowiki><pre></nowiki></code> and <code><nowiki><code></nowiki></code>. '''As noted above:''' even the content of <code><pre></code> and <code><code></code> must be properly quoted according to the XML rules: use XML entities for less-than, greater-than and ampersand: <code>&lt;</code>, <code>&gt;</code> and <code>&amp;</code>
* You don't have to quote the XML special characters inside the text content of the <code><nowiki><texcode></nowiki></code>, <code><nowiki><xmlcode></nowiki></code>, and <code><nowiki><context></nowiki></code> tags. These three are handled as special cases to make porting existing pages easier ([[Extension:ConTeXtXML#Implementation notes]] explains this in more detail).
* Outside of <code><nowiki><texcode></nowiki></code>, <code><nowiki><xmlcode></nowiki></code>, and <code><nowiki><context></nowiki></code>, it may be better to use <code><nowiki><amp/></nowiki></code> and <code><nowiki><lt/></nowiki></code> instead of XML entities to prevent problems with the Edit Preview functionality.
* You can also use the regular [http://www.mediawiki.org/wiki/Help:Formatting wikicode markup].
* Almost all inline wiki code can be used almost anywhere(the exception is <code><nowiki></code> which is forbidden, and there are a few input fields are explicitly marked as 'plain text').