MATRIX_SPEC( TABLE_NAME( [ database-name . ] table name ), ROW_AXIS ( { TIMECODE | SEQUENCE } ( field ) ) , COLUMN_AXIS ( { TIMECODE | SEQUENCE } ( field ) ) , MATRIX_ID ( field-list ) , [ID_SEQUENCE ( instance-identifier-list-json-string ) ,] PAYLOAD ( FIELDS ( field-list ) , CONTENT ( { REAL | COMPLEX | AMPL_PHASE | AMPL_PHASE_RADIANS | AMPL_PHASE_DEGREES | MULTIVAR_REAL | MULTIVAR_COMPLEX | MULTIVAR_ANYTYPE MULTIVAR_AMPL_PHASE | MULTIVAR_AMPL_PHASE_RADIANS | MULTIVAR_AMPL_PHASE_DEGREES } ) ) , [LAYER ( layer-name ) ] )