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<h4 class="subsection">3.1.2 Key and reserved words</h4>

<p><a name="index-keywords-171"></a>The keywords of <code>sketch</code> are <code>picturebox</code> <code>curve</code>
<code>def</code> <code>dots</code> <code>frame</code> <code>global</code> <code>input</code>
<code>line</code> <code>polygon</code> <code>put</code> <code>repeat</code> <code>set</code>
<code>sweep</code> and <code>then</code>.  The <code>sketch</code> parser will note a
syntax error if any of these are used in place of a proper identifier.

   <p>In addition, there are reserved words
<a name="index-reserved-words-172"></a>that can currently be defined by the user, but with the risk that
future versions of <code>sketch</code> will reject those definitions.  The
reserved words are <code>atan2</code> <code>cos</code> <code>inverse</code>
<code>perspective</code> <code>project</code> <code>rotate</code> <code>scale</code>
<code>sin</code> <code>special</code> <code>sqrt</code> <code>translate</code> <code>unit</code> and
<code>view</code>.

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