When ELEMENTS_LIST is used as the parameter for the methods setFromElementTypesUseQueryOrElementsList and setToElementTypesUseQueryOrElementsList, it indicates that elements selected in the element types list will be used to specify the "from" element types or "to" element types for the matrix.
When ELEMENTS_LIST is used as the parameter for the methods setFromElementTypesUseQueryOrElementsList and setToElementTypesUseQueryOrElementsList, it indicates that elements selected in the element types list will be used to specify the "from" element types or "to" element types for the relation table.