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<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd-->
<html xmlns="http://www.w3.org/1999/xhtml"
>
<head><title>9 Lexical Syntax</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)" />
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<meta name="src" content="eulisp.tex" />
<meta name="date" content="2010-10-20 18:07:00" />
<link rel="stylesheet" type="text/css" href="eulisp.css" />
</head><body
>
<!--l. 1--><div class="crosslinks"><p class="noindent">[<a
href="eulispcl10.html" >next</a>] [<a
href="eulispcl8.html" >prev</a>] [<a
href="eulispcl8.html#taileulispcl8.html" >prev-tail</a>] [<a
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<h3 class="clauseHead"> 9 <a
id="x11-480009"></a>Lexical Syntax</h3>
<a
id="dx11-48001"></a>
<!--l. 5--><p class="noindent" >
</p>
<h4 class="sclauseHead"> 9.1 <a
id="x11-490009.1"></a>Character Set</h4> <a
id="dx11-49001"></a>
Case<a
id="dx11-49002"></a> is distinguished in each of characters, strings and identifiers,
so that <span
class="cmtt-9">variable-name </span>and <span
class="cmtt-9">Variable-name </span>are different, but where
a character is used in a positional number representation
(<span
class="cmti-9">e.g.</span><span
class="cmti-9"> </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\x3Ad</span></span></span>) the case is ignored. Thus, case is also significant in
this definition and, as will be observed later, all the special form
and standard function names are lower case. In this section, and
throughout this text, the names for individual character glyphs are
those used in <span class="cite">[<a
href="eulispcl3.html#Xiso646">ISO 646 : 1991</a>]</span>.
<!--l. 10--><p class="noindent" >The minimal character set <a
id="dx11-49003"></a>to support <span
class="cmr-8">E</span><span
class="cmr-7">U</span><span
class="cmr-8">L</span><span
class="cmr-7">ISP</span> is defined in syntax
table <a
href="#x11-490009.1">9.1<!--tex4ht:ref: character-set --></a>. The language as defined in this text uses only the
characters given in this table. Thus, left hand sides of the
productions in this table define and name groups of characters
which are used later in this definition: <a
href="#x11-500009.1.0.1"><span
class="cmti-9">decimal-digit</span></a>, <a
href="#x11-500009.1.0.1"><span
class="cmti-9">upper-letter</span></a>,
<a
href="#x11-500009.1.0.1"><span
class="cmti-9">lower-letter</span></a>, <a
href="#x11-530009.3"><span
class="cmti-9">letter</span></a>, <a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a> and <a
href="#x11-500009.1.0.1"><span
class="cmti-9">special-character</span></a>. Any
character not specified here is classified under <a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a>,
which permits its use as an initial or a constituent character of an
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> (see <span
class="cmsy-9">§</span> <a
href="#x11-540009.3.0.3">9.3.0.3<!--tex4ht:ref: identifier-syntax --></a>).
</p>
<h5 class="syntaxssclauseHead"> 9.1.0.1 <a
id="x11-500009.1.0.1"></a><span
class="cmbx-8">Syntax</span></h5><a
id="dx11-50001"></a>
<!--l. 48--><p class="noindent" ><div class="framebox-l"
style="width:27.14em;"> </p><div class="minipage"><table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">decimal-digit</span><span
class="cmtt-9">: one of</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">0 1 2 3 4 5 6 7 8 9</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">upper-letter</span><span
class="cmtt-9">: one of</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">A B C D E F G H I J K L M</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">N O P Q R S T U V W X Y Z</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">lower-letter</span><span
class="cmtt-9">: one of</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">a b c d e f g h i j k l m</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">n o p q r s t u v w x y z</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">letter</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">upper-letter</span></a></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">lower-letter</span></a></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">normal-other-character</span><span
class="cmtt-9">: one of</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">* / < = > + .</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">other-character</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">normal-other-character</span></a></td><td
class="tabbing"><span
class="cmtt-9">-</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">special-character</span><span
class="cmtt-9">: one of</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">; ’ , </span><span
class="cmsy-9">\ </span><span
class="cmtt-9">" # ( ) ‘ | @</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">level-0-character</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">decimal-digit</span></a></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-530009.3"><span
class="cmti-9">letter</span></a></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a></td></tr></table>
<!--l.10 48--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">special-character</span></a></td></tr></table>
<!--l.10 48--> </div></div>
<h4 class="sclauseHead"> 9.2 <a
id="x11-510009.2"></a>Whitespace and Comments</h4> <a
id="dx11-51001"></a>
Whitespace characters<a
id="dx11-51002"></a> are spaces, newlines, line feeds, carriage
returns, character tabulations, line tabulations and form feeds. The
newline character is also used to represent end of record for
configurations providing such an input model, thus, a reference to
newline in this definition should also be read as a reference
to end of record. Whitespace separates tokens and is only
significant in a string or when it occurs escaped within an
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>.
<!--l. 9--><p class="noindent" >A line comment <a
id="dx11-51003"></a>is introduced by a <span
class="cmti-9">semicolon </span>(<span class="obeylines-h"><span class="verb"><span
class="cmtt-9">;</span></span></span>) and continues up
to, but does not include, the end of the line. Hence, a line comment
cannot occur in the middle of a token because of the whitespace in
the form of the newline which is to <a
href="#x11-520009.2.0.2"><span
class="cmti-9">whitespace</span></a>. An <a
href="#x11-560009.4.0.4"><span
class="cmti-9">object</span></a> comment
<a
id="dx11-51004"></a>is introduced by the <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#;</span></span></span> sequence optionally followed by <a
href="#x11-520009.2.0.2"><span
class="cmti-9">whitespace</span></a>
and an <a
href="#x11-560009.4.0.4"><span
class="cmti-9">object</span></a> to be “commented out”.
</p>
<h5 class="syntaxssclauseHead"> 9.2.0.2 <a
id="x11-520009.2.0.2"></a><span
class="cmbx-8">Syntax</span></h5> <a
id="dx11-52001"></a>
<!--l. 33--><p class="noindent" ><div class="framebox-l"
style="width:27.14em;"> </p><div class="minipage"><table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">whitespace</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">space</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">newline</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">line-feed</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">return</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">tab</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">vertical-tab</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">form-feed</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">comment</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">; </span><span
class="cmti-9">all subsequent characters</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmti-9">up to the end of the line</span></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">#; </span><a
href="#x11-520009.2.0.2"><span
class="cmti-9">whitespace</span><span
class="cmsy-6">*</span></a> <a
href="#x11-560009.4.0.4"><span
class="cmti-9">object</span></a></td></tr></table>
<!--l.10 33--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"></td></tr></table>
<!--l.10 33--> </div></div>
<a
id="x11-52002r1"></a>
<!--l. 36--><p class="noindent" >
</p><div class="note">
<span
class="cmr-8">NOTE</span><span
class="cmr-8"> 1</span> <span
class="cmr-8">There is no notation in E</span><span
class="cmr-7">U</span><span
class="cmr-8">L</span><span
class="cmr-7">ISP</span><span
class="cmr-8"> for block comments.</span></div>
<!--l. 119--><p class="noindent" >
</p>
<h4 class="sclauseHead"> 9.3 <a
id="x11-530009.3"></a>Identifiers</h4> <a
id="dx11-53001"></a>
Identifiers<a
id="dx11-53002"></a> in <span
class="cmr-8">E</span><span
class="cmr-7">U</span><span
class="cmr-8">L</span><span
class="cmr-7">ISP</span> are very similar lexically to <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>s in
other Lisps and in other programming languages. Informally, an
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a><a
id="dx11-53003"></a> is a sequence of <span
class="cmti-9">letter</span>, <a
href="#x11-500009.1.0.1"><span
class="cmti-9">decimal-digit</span></a> and <a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a>s
starting with a character that is not a <a
href="#x11-500009.1.0.1"><span
class="cmti-9">decimal-digit</span></a>. <a
href="#x11-500009.1.0.1"><span
class="cmti-9">special-character</span></a>s
must be escaped if they are to be used in the names of <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>s.
However, because the common notations for arithmetic operations
are the glyphs for plus (<span class="obeylines-h"><span class="verb"><span
class="cmtt-9">+</span></span></span>) and minus (<span class="obeylines-h"><span class="verb"><span
class="cmtt-9">-</span></span></span>), which are also used to
indicate the sign of a number, these glyphs are classified as
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>s<a
id="dx11-53004"></a> in their own right as well as being part of the syntax of
a number.
<!--l. 15--><p class="noindent" >Sometimes, it might be desirable to incorporate characters in an
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> that are normally not legal constituents. The aim of
escaping in <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>s is to change the meaning of particular
characters so that they can appear where they are not otherwise
acceptable. Identifiers containing characters that are not
ordinarily legal constituents can be written by delimiting the
sequence of characters by <span
class="cmti-9">multiple-escape</span>, the glyph for which
is called <span
class="cmti-9">vertical bar </span>(<span class="obeylines-h"><span class="verb"><span
class="cmtt-9">|</span></span></span>). The <span
class="cmti-9">multiple-escape </span>denotes the
beginning of an escaped <span
class="cmti-9">part </span>of an <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> and the next
<span
class="cmti-9">multiple-escape </span>denotes the end of an escaped part of an
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>. A single character that would otherwise not be a legal
constituent can be written by preceding it with <span
class="cmti-9">single-escape</span>,
the glyph for which is called <span
class="cmti-9">reverse solidus </span>(<span class="obeylines-h"><span class="verb"><span
class="cmtt-9">\</span></span></span>). Therefore,
<span
class="cmti-9">single-escape </span>can be used to incorporate the <span
class="cmti-9">multiple-escape </span>or the
<span
class="cmti-9">single-escape </span>character in an <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a>, delimited (or not) by
<span
class="cmti-9">multiple-escape</span>s. For example, <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">|).(|</span></span></span> is the <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> whose name
contains the three characters <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\)</span></span></span>, <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\.</span></span></span> and <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\(</span></span></span>, and <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">a|b|</span></span></span> is the
<a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> whose name contains the characters <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\a</span></span></span> and <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">#\b</span></span></span>. The
sequence <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">||</span></span></span> is the <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> with no name, and so is <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">||||</span></span></span>,
but <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">|\||</span></span></span> is the <a
href="#x11-540009.3.0.3"><span
class="cmti-9">identifier</span></a> whose name contains the single
character <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">|</span></span></span>, which can also be written <span class="obeylines-h"><span class="verb"><span
class="cmtt-9">\|</span></span></span>, without delimiting
<span
class="cmti-9">multiple-escape</span>s.
</p><!--l. 38--><p class="noindent" >
</p>
<h5 class="syntaxssclauseHead"> 9.3.0.3 <a
id="x11-540009.3.0.3"></a><span
class="cmbx-8">Syntax</span></h5><a
id="dx11-54001"></a>
<!--l. 78--><p class="noindent" ><div class="framebox-l"
style="width:27.14em;"> </p><div class="minipage"><table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">identifier</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-identifier</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">peculiar-identifier</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-identifier</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">normal-identifier</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-initial</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-constituent</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">normal-initial</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-530009.3"><span
class="cmti-9">letter</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">normal-other-character</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">normal-constituent</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-530009.3"><span
class="cmti-9">letter</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">decimal-digit</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">peculiar-identifier</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">{</span><span
class="cmtt-9">+ | -</span><span
class="cmsy-9">}</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">{</span><a
href="#x11-540009.3.0.3"><span
class="cmti-9">peculiar-constituent</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-constituent</span><span
class="cmsy-6">*</span></a><span
class="cmsy-9">}</span>
<span
class="cmmi-6">opt</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">. </span><a
href="#x11-540009.3.0.3"><span
class="cmti-9">peculiar-constituent</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-constituent</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">peculiar-constituent</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-530009.3"><span
class="cmti-9">letter</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">other-character</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">escaped-identifier</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequence</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequences</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-initial</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequences</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">\</span><a
href="#x11-500009.1.0.1"><span
class="cmti-9">level-0-character</span></a> <a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequences</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">escaped-sequences</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequence</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-or-normal-constituent</span><span
class="cmsy-6">*</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">escaped-sequence</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmtt-9">|</span><a
href="#x11-540009.3.0.3"><span
class="cmti-9">escaped-sequence-constituent</span><span
class="cmsy-6">*</span></a><span
class="cmtt-9">|</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">escaped-or-normal-constituent</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">\</span><a
href="#x11-500009.1.0.1"><span
class="cmti-9">level-0-character</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-540009.3.0.3"><span
class="cmti-9">normal-constituent</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">escaped-sequence-constituent</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">\</span><a
href="#x11-500009.1.0.1"><span
class="cmti-9">level-0-character</span></a></td></tr></table>
<!--l.10 78--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-500009.1.0.1"><span
class="cmti-9">level-0-character</span></a> <span
class="cmtt-9">other than |</span></td></tr></table>
<!--l.10 78--> </div></div>
<!--l. 205--><p class="noindent" >
</p>
<h4 class="sclauseHead"> 9.4 <a
id="x11-550009.4"></a>Objects</h4> <a
id="dx11-55001"></a>
An object is either a <a
href="#x11-560009.4.0.4"><span
class="cmti-9">literal</span></a>, a <a
href="eulispcl16.html#x20-88000016.17.1.1"><span
class="cmti-9">symbol</span></a> or a <a
href="eulispcl16.html#x20-59700016.12.7.1"><span
class="cmti-9">list</span></a>. The syntax of the
classes of objects that can be read by <span
class="cmr-8">E</span><span
class="cmr-7">U</span><span
class="cmr-8">L</span><span
class="cmr-7">ISP</span> is defined in the
section of this definition corresponding to the class as defined
below:
<h5 class="syntaxssclauseHead"> 9.4.0.4 <a
id="x11-560009.4.0.4"></a><span
class="cmbx-8">Syntax</span></h5> <a
id="dx11-56001"></a>
<!--l. 21--><p class="noindent" ><div class="framebox-l"
style="width:27.14em;"> </p><div class="minipage"><table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">object</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-560009.4.0.4"><span
class="cmti-9">literal</span></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-59700016.12.7.1"><span
class="cmti-9">list</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-58700016.12"><span
class="cmtt-9">16.12</span><!--tex4ht:ref: list --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-88000016.17.1.1"><span
class="cmti-9">symbol</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-87900016.17"><span
class="cmtt-9">16.17</span><!--tex4ht:ref: symbol --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td
class="tabbing"><span
class="cmti-9">literal</span><span
class="cmtt-9">:</span></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td
class="tabbing"><a
href="#x11-580009.5.0.5"><span
class="cmti-9">boolean</span></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-32800016.1.1.1"><span
class="cmti-9">character</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-32700016.1"><span
class="cmtt-9">16.1</span><!--tex4ht:ref: character --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-52200016.7.1.1"><span
class="cmti-9">float</span></a></td><td style="width:14px;"
class="tabbing"></td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-52100016.7"><span
class="cmtt-9">16.7</span><!--tex4ht:ref: float --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-56100016.10.1.1"><span
class="cmti-9">integer</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-56000016.10"><span
class="cmtt-9">16.10</span><!--tex4ht:ref: integer --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-85400016.16.1.1"><span
class="cmti-9">string</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-85300016.16"><span
class="cmtt-9">16.16</span><!--tex4ht:ref: string --></a></td></tr></table>
<!--l.10 21--> <table
cellpadding="0" border="0" cellspacing="0"
class="tabbing"><tr
style="vertical-align:baseline;" class="tabbing"><td style="width:42px;"
class="tabbing"> </td><td style="width:14px;"
class="tabbing"><a
href="eulispcl16.html#x20-90800016.19.1.1"><span
class="cmti-9">vector</span></a></td><td style="width:14px;"
class="tabbing"> </td><td style="width:219px;"
class="tabbing"> </td><td
class="tabbing"><span
class="cmsy-9">§</span><a
href="eulispcl16.html#x20-90700016.19"><span
class="cmtt-9">16.19</span><!--tex4ht:ref: vector --></a></td></tr></table>
<!--l.10 21--> </div></div>
<!--l. 23--><p class="noindent" >
</p>
<h4 class="sclauseHead"> 9.5 <a
id="x11-570009.5"></a>Boolean</h4> <a
id="dx11-57001"></a> A boolean value is either <span
class="cmti-9">false</span> <a
id="dx11-57002"></a>, which is represented
by the empty list—written <a
href="eulispcl16.html#x20-587009r2"><span
class="cmtt-9">()</span></a> and is also the value of <span
class="cmbx-9">??</span>—or <span
class="cmti-9">true</span> <a
id="dx11-57003"></a>,
which is represented by any other value than <a
href="eulispcl16.html#x20-587009r2"><span
class="cmtt-9">()</span></a> or if specified as
<a
href="eulispcl12.html#x16-123001r3"><span
class="cmtt-9">t</span></a>:
<h5 class="syntaxssclauseHead"> 9.5.0.5 <a
id="x11-580009.5.0.5"></a><span
class="cmbx-8">Syntax</span></h5> <a
id="dx11-58001"></a>
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style="width:27.14em;"> </p><div class="minipage"><table
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