help/info/ifpresent.html

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   8  Contributors:
   9   Baji, Laszlo
  10   Balasko, Jeno
  11   Farkas, Laszlo
  12   Szabados, Kristof
  13   Szabo, Janos Zoltan – initial implementation
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  19 <title>ifpresent</title>
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  38 <h1>ifpresent</h1>
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  40 <p>The keyword is only used in conjunction with <font face="Courier New"><b>template</b></font> definition. It denotes one&nbsp; the matching mechanism where the <a href="template.html#ifpresent">listed
  41 values are only checked</a> when the field is present. It can be applied to optional fields only.
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  43 <p>Related keyword:</p>
  44 <ul>
  45   <li><a href="template.html"><b><font face="Courier New" color="#003258" size="4">template</font></b></a></li>
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  53     <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>(</b></font><i>value_list</i><font face="Courier New" color="#003258" size="5"><b>)ifpresent</b></font></h3>
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  59 <ul>
  60   <li>
  61   <p><i>value_list</i> is a comma separated list containing all the values that are&nbsp; permitted for the concerned field. It will only be checked when the field is present.</p>
  62   </li>
  63 </ul>
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  66 <p><a HREF="BNF.html#ifpresentmatch">BNF definition</a> of <font face="Courier New">ifpresent</font></p>
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