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The keyword is only used in conjunction with template definition. It denotes the matching mechanism where the incoming field must contain all elements defined in the value list of subset, and may contain others. It is applicable to fields of set of types only.
Related keyword:
superset{value_list} |
value_list is a comma separated list containing all the values that the concerned field must contain. The field may contain elements not included in the list.
BNF definition of superset