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<h1>subset</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 the matching mechanism where the incoming field <a
href="template.html#subset">may contain only</a> elements defined in the value list of subset, and may contain less. It is applicable to fields <font face="Courier New" size="4"><b>set</b></font> <font
face="Courier New" size="4"><b>of</b></font> types only.
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<p>Related keyword:</p>
<ul>
<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>subset(</b></font><i>value_list</i><font face="Courier New" color="#003258" size="5"><b>)</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. The field must not contain elements not included in the list.</p>
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<p><a name="Example 1">Example 1</a>
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<p>type set of integer MySetOfType (0 .. 10);
<p>template MySetOfType MyTemplate1 := subset (1, 2, 3);
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<p>matches any sequence of integers which contains zero or one occurrences of the numbers 1, 2 and 3 in any order and position </p>
<p><a name="Example 2">Example 2</a>
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<p>template MySetOfType MyTemplate2 := subset (1, 2, ?);
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<p>matches any sequence of integers which contains zero or one occurrences of the numbers 1, 2 and a valid integer value (i.e. between 0 and 10, inclusive) in any order and position </p>
<p><a name="Example 3">Example 3</a>
<font face="Courier New">
<p>type record of integer RoI;
<p>type set of integer SoI;
<p>template RoI t_RoI1 := {1, 2, ?};
<p>template SoI t_SoI1 := subset(all from t_RoI1);
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<p>Results in subset(1, 2, ?).</p>
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<p><a HREF="BNF.html#subsetmatch">BNF definition</a> of <font face="Courier New">subset</font></p>
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