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/**
 * Add a search facet group to an existing search facet group definition
 * @param searchFacetGroup the search facet group to add.
 */
void addSearchFacetGroup(SearchFacetGroup searchFacetGroup);

/**
 * Remove the SearchFacetGroup with the specified identifier from the set of search facets groups
 * @param identifier the identifier of the the search facet group that needs to be removed.
 */
void removeSearchFacetGroup(String identifier);