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54 | ||
55 | <H1><A NAME="SECTION004300000000000000000"></A><A NAME="identifiers"></A><a id='l2h-10' xml:id='l2h-10'></a> | |
56 | <BR> | |
57 | 2.3 Identifiers and keywords | |
58 | </H1> | |
59 | ||
60 | <P> | |
61 | Identifiers (also referred to as <em>names</em>) are described by the following | |
62 | lexical definitions: | |
63 | ||
64 | <P> | |
65 | <dl><dd class="grammar"> | |
66 | <div class="productions"> | |
67 | <table> | |
68 | <tr> | |
69 | <td><a id='tok-identifier' xml:id='tok-identifier'>identifier</a></td> | |
70 | <td>::=</td> | |
71 | <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> | |
72 | <tr> | |
73 | <td><a id='tok-letter' xml:id='tok-letter'>letter</a></td> | |
74 | <td>::=</td> | |
75 | <td><a class='grammartoken' href="identifiers.html#tok-lowercase">lowercase</a> | <a class='grammartoken' href="identifiers.html#tok-uppercase">uppercase</a></td></tr> | |
76 | <tr> | |
77 | <td><a id='tok-lowercase' xml:id='tok-lowercase'>lowercase</a></td> | |
78 | <td>::=</td> | |
79 | <td>"a"..."z"</td></tr> | |
80 | <tr> | |
81 | <td><a id='tok-uppercase' xml:id='tok-uppercase'>uppercase</a></td> | |
82 | <td>::=</td> | |
83 | <td>"A"..."Z"</td></tr> | |
84 | <tr> | |
85 | <td><a id='tok-digit' xml:id='tok-digit'>digit</a></td> | |
86 | <td>::=</td> | |
87 | <td>"0"..."9"</td></tr> | |
88 | </table> | |
89 | </div> | |
90 | <a class="grammar-footer" | |
91 | href="grammar.txt" type="text/plain" | |
92 | >Download entire grammar as text.</a> | |
93 | </dd></dl> | |
94 | ||
95 | <P> | |
96 | Identifiers are unlimited in length. Case is significant. | |
97 | ||
98 | <P> | |
99 | ||
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103 | <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a> | |
104 | ||
105 | <UL CLASS="ChildLinks"> | |
106 | <LI><A href="keywords.html">2.3.1 Keywords</a> | |
107 | <LI><A href="id-classes.html">2.3.2 Reserved classes of identifiers</a> | |
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146 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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