help/info/subset.html

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  13 <title>subset</title>
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  32 <h1>subset</h1>
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  34 <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
  35   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
  36   face="Courier New" size="4"><b>of</b></font> types only.
  37 <hr align="left" width="50%">
  38 <p>Related keyword:</p>
  39 <ul>
  40   <li><a href="template.html"><b><font face="Courier New" color="#003258" size="4">template</font></b></a></li>
  41 </ul>
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  47     <td width="100%">
  48     <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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  54 <ul>
  55   <li>
  56   <p><i>value_list</i> is a comma separated list containing all the values that are&nbsp; permitted for the concerned field. The field must not contain elements not included in the list.</p>
  57   </li>
  58 </ul>
  59 <hr align="left" width="50%">
  60 <p><a name="Example 1">Example 1</a>
  61 <font face="Courier New">
  62         <p>type set of integer MySetOfType (0 .. 10);
  63         <p>template MySetOfType MyTemplate1 := subset (1, 2, 3);
  64 </font>
  65 <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>
  66 <p><a name="Example 2">Example 2</a>
  67 <font face="Courier New">
  68         <p>template MySetOfType MyTemplate2 := subset (1, 2, ?);
  69 </font>
  70 <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>
  71 <p><a name="Example 3">Example 3</a>
  72 <font face="Courier New">
  73         <p>type record of integer RoI;
  74         <p>type set of integer SoI;
  75         <p>template RoI t_RoI1 := {1, 2, ?};
  76         <p>template SoI t_SoI1 := subset(all from t_RoI1);
  77 </font>
  78 <p>Results in subset(1, 2, ?).</p>
  79 <hr align="left" width="50%">
  80 <p><a HREF="BNF.html#subsetmatch">BNF definition</a> of <font face="Courier New">subset</font></p>
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