ssmt_num, /* a numeric value that requires a SPARQL FILTER */
ssmt_str, /* a string value that requieres a SPARQL FILTER */
ssmt_fts, /* a string value that will be queried with SPARQL 'fts:match' */
ssmt_num, /* a numeric value that requires a SPARQL FILTER */
ssmt_str, /* a string value that requieres a SPARQL FILTER */
ssmt_fts, /* a string value that will be queried with SPARQL 'fts:match' */