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<H1><A NAME="SECTION004300000000000000000"></A><A NAME="identifiers"></A><a id='l2h-10' xml:id='l2h-10'></a>
<BR>
2.3 Identifiers and keywords
</H1>

<P>
Identifiers (also referred to as <em>names</em>) are described by the following
lexical definitions:

<P>
<dl><dd class="grammar">
<div class="productions">
<table>
<tr>
    <td><a id='tok-identifier' xml:id='tok-identifier'>identifier</a></td>
    <td>::=</td>
    <td>(<a class='grammartoken' href="identifiers.html#tok-letter">letter</a>|"_") (<a class='grammartoken' href="identifiers.html#tok-letter">letter</a> | <a class='grammartoken' href="identifiers.html#tok-digit">digit</a> | "_")*</td></tr>
  <tr>
    <td><a id='tok-letter' xml:id='tok-letter'>letter</a></td>
    <td>::=</td>
    <td><a class='grammartoken' href="identifiers.html#tok-lowercase">lowercase</a> | <a class='grammartoken' href="identifiers.html#tok-uppercase">uppercase</a></td></tr>
  <tr>
    <td><a id='tok-lowercase' xml:id='tok-lowercase'>lowercase</a></td>
    <td>::=</td>
    <td>"a"..."z"</td></tr>
  <tr>
    <td><a id='tok-uppercase' xml:id='tok-uppercase'>uppercase</a></td>
    <td>::=</td>
    <td>"A"..."Z"</td></tr>
  <tr>
    <td><a id='tok-digit' xml:id='tok-digit'>digit</a></td>
    <td>::=</td>
    <td>"0"..."9"</td></tr>
</table>
</div>
<a class="grammar-footer"
  href="grammar.txt" type="text/plain"
  >Download entire grammar as text.</a>
</dd></dl>

<P>
Identifiers are unlimited in length.  Case is significant.

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<LI><A href="keywords.html">2.3.1 Keywords</a>
<LI><A href="id-classes.html">2.3.2 Reserved classes of identifiers</a>
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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