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The keyword is only used in conjunction with template definition. It denotes the matching mechanism where the incoming field may contain only elements defined in the value list of subset, and may contain less. It is applicable to fields set of types only.
Related keyword:
subset{value_list} |
value_list 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.
BNF definition of subset