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<H1> 2.3 Identifiers</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <FONT FACE="Arial, Helvetica">Identifier</FONT>s
are used as names. </DIV>
<H4 ALIGN=CENTER>Syntax</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="SyntaxIndented"><FONT FACE="Arial, Helvetica">identifier<A NAME="I1175"></A>
::= </FONT><BR>
<A NAME="I1176"></A><FONT FACE="Arial, Helvetica">identifier_letter</FONT> {[<A NAME="I1177"></A><FONT FACE="Arial, Helvetica">underline</FONT>] <A NAME="I1178"></A><FONT FACE="Arial, Helvetica">letter_or_digit</FONT>}</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="SyntaxIndented"><FONT FACE="Arial, Helvetica">letter_or_digit<A NAME="I1179"></A>
::= </FONT><A NAME="I1180"></A><FONT FACE="Arial, Helvetica">identifier_letter</FONT> | <A NAME="I1181"></A><FONT FACE="Arial, Helvetica">digit</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="SyntaxIndented">An <FONT FACE="Arial, Helvetica">identifier</FONT>
shall not be a reserved word. </DIV>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Normal"> All characters of an <FONT FACE="Arial, Helvetica">identifier</FONT>
are significant, including any underline character. <A NAME="I1182"></A><FONT FACE="Arial, Helvetica">Identifier</FONT>s
differing only in the use of corresponding upper and lower case letters
are considered the same. </DIV>
<H4 ALIGN=CENTER>Implementation Permissions</H4>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Normal"> In a nonstandard mode, an implementation may support
other upper/lower case equivalence rules for <FONT FACE="Arial, Helvetica">identifier</FONT>s,
to accommodate local conventions. </DIV>
<H4 ALIGN=CENTER>Examples</H4>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> <I>Examples of identifiers:</I>
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="SyntaxIndented">Count X Get_Symbol Ethelyn Marion<BR>
<BR>
Snobol_4 X1 Page_Count Store_Next_Item</DIV>
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