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<!--
 Copyright (c) 2000-2017 Ericsson Telecom AB
 All rights reserved. This program and the accompanying materials
 are made available under the terms of the Eclipse Public License v1.0
 which accompanies this distribution, and is available at
 http://www.eclipse.org/legal/epl-v10.html

 Contributors:
  
  Baji, Laszlo
  Balasko, Jeno
  Csorba, Mate
  Farkas, Laszlo
  Gecse, Roland
  Szabados, Kristof
-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="en-us">
<title>optional</title>
</head>
<body bgcolor="#DAD3C5" vlink="#0094D2" link="#003258">
<table align="left" border="0" cellspacing="0" cellpadding="0" valign=top>
  <tr>
    <td width=105 height=40><a href="https://projects.eclipse.org/projects/tools.titan"><img src="../images/titan_transparent.gif" border=0 width=105 height=40 align="left" alt="Titan"></a></td>
  </tr>
</table>
<table border="0" align="right" cellpadding="0" cellspacing="0">
  <tr>
    <td><a href="../titan_main.html" alt="contents"><img border="0" src="../images/ao.jpg" width="53" height="40"></a></td>
    <td><a href="../titan_index.html" alt="index"><img border="0" src="../images/up.jpg" width="53" height="40"></a></td>
    <td><a href="operators.html" alt="previous"><img border="0" src="../images/left.jpg" width="53" height="40"></a></td>
    <td><a href="or.html" alt="next"><img border="0" src="../images/right.jpg" width="53" height="40"></a></td>
  </tr>
</table>
<p><br clear="all">
</p>
<hr>
<h1>optional</h1>
<hr align="left" width="75%">
<p>The keyword is only used in conjunction with the keyword <font face="Courier New"><b>record</b></font> and <font face="Courier New"><b>set</b></font> to indicate that the concerned field may or
may not be present.
<hr align="left" width="50%">
<p>Related keywords:</p>
<ul>
  <li><a href="omit.html"><b><font face="Courier New" color="#003258" size="4">omit</font></b></a></li>
  <li><a href="record.html"><b><font face="Courier New" color="#003258" size="4">record</font></b></a></li>
  <li><a href="set.html"><b><font face="Courier New" color="#003258" size="4">set</font></b></a></li>
  <li><a href="ispresent.html"><b><font face="Courier New" color="#003258" size="4">ispresent</font></b></a></li>
</ul>
<hr align="left" width="50%">
<div align="center">
<center>
<table border="0" width="90%" bgcolor="#FFB599" cellpadding="4">
  <tr>
    <td width="100%">
    <h3 align="center">... <font face="Courier New" color="#003258" size="5"><b>optional</b></font></h3>
    </td>
  </tr>
</table>
</center>
</div>
<hr align="left" width="25%">
<hr align="left" width="25%">
<p><a HREF="BNF.html#optionalkeyword">BNF definition</a> of <font face="Courier New">optional</font></p>
</body>
</html>