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copied!<p>Clearly, this question is purely academic. Fortunately, it has a very definite answer.</p> <p>You cannot escape a CDATA end sequence. Production rule 20 of the XML <a href="http://www.w3.org/TR/REC-xml/#sec-cdata-sect" rel="noreferrer">specification</a> is quite clear:</p> <pre><code>[20] CData ::= (Char* - (Char* ']]>' Char*)) </code></pre> <p>EDIT: This product rule literally means "A CData section may contain anything you want BUT the sequence ']]>'. No exception.".</p> <p>EDIT2: The <a href="http://www.w3.org/TR/REC-xml/#sec-cdata-sect" rel="noreferrer">same section</a> also reads:</p> <blockquote> <p>Within a CDATA section, only the CDEnd string is recognized as markup, so that left angle brackets and ampersands may occur in their literal form; they need not (and cannot) be escaped using "<code>&lt;</code>" and "<code>&amp;</code>". CDATA sections cannot nest.</p> </blockquote> <p>In other words, it's not possible to use entity reference, markup or any other form of interpreted syntax. The only parsed text inside a CDATA section is <code>]]></code>, and it terminates the section.</p> <p>Hence, it is not possible to escape <code>]]></code> within a CDATA section.</p> <p>EDIT3: The <a href="http://www.w3.org/TR/REC-xml/#sec-cdata-sect" rel="noreferrer">same section</a> also reads: </p> <blockquote> <p>2.7 CDATA Sections</p> <p>[Definition: CDATA sections may occur anywhere character data may occur; they are used to escape blocks of text containing characters which would otherwise be recognized as markup. CDATA sections begin with the string "<![CDATA[" and end with the string "]]>":] </p> </blockquote> <p>Then there may be a CDATA section anywhere character data may occur, including multiple adjacent CDATA sections inplace of a single CDATA section. That allows it to be possible to split the <code>]]></code> token and put the two parts of it in adjacent CDATA sections.</p> <p>ex:</p> <pre><code><![CDATA[Certain tokens like ]]> can be difficult and <invalid>]]> </code></pre> <p>should be written as</p> <pre><code><![CDATA[Certain tokens like ]]]]><![CDATA[> can be difficult and <valid>]]> </code></pre>

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