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    copied!<p>The documentation in the w3 link </p> <p><a href="http://www.w3.org/TR/REC-xml/#sec-starttags" rel="noreferrer">http://www.w3.org/TR/REC-xml/#sec-starttags</a></p> <p>says that this are the recomended forms.</p> <pre><code>&lt;test&gt;&lt;/test&gt; &lt;test/&gt; </code></pre> <p>The attribute mentioned in the other answer is validation mechanism and not a representation of state. Please refer to the <a href="http://www.w3.org/TR/xmlschema-1/#xsi_nil" rel="noreferrer">http://www.w3.org/TR/xmlschema-1/#xsi_nil</a></p> <blockquote> <p>XML Schema: Structures introduces a <strong>mechanism for signaling that an element should be accepted as ·valid·</strong> when it has no content despite a content type which does not require or even necessarily allow empty content. An element may be ·valid· without content if it has the attribute xsi:nil with the value true. <strong>An element so labeled must be empty</strong>, but can carry attributes if permitted by the corresponding complex type.</p> </blockquote> <p>To clarify this answer: Content </p> <pre><code> &lt;Book&gt; &lt;!--Invalid construct since the element attribute xsi:nil="true" signal that the element must be empty--&gt; &lt;BuildAttributes HardCover="true" Glued="true" xsi:nil="true"&gt; &lt;anotherAttribute name="Color"&gt;Blue&lt;/anotherAttribute&gt; &lt;/BuildAttributes&gt; &lt;Index&gt;&lt;/Index&gt; &lt;pages&gt; &lt;page pageNumber="1"&gt;Content&lt;/page&gt; &lt;/pages&gt; &lt;!--Missing ISBN number could be confusing and misguiding since its not present--&gt; &lt;/Book&gt; &lt;/Books&gt; </code></pre>
 

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