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<h1>ifpresent</h1>
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<p>The keyword is only used in conjunction with <font face="Courier New"><b>template</b></font> definition. It denotes one the matching mechanism where the <a href="template.html#ifpresent">listed
values are only checked</a> when the field is present. It can be applied to optional fields only.
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<li><a href="template.html"><b><font face="Courier New" color="#003258" size="4">template</font></b></a></li>
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<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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<p><i>value_list</i> is a comma separated list containing all the values that are permitted for the concerned field. It will only be checked when the field is present.</p>
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<p><a HREF="BNF.html#ifpresentmatch">BNF definition</a> of <font face="Courier New">ifpresent</font></p>
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