| anchor | enum | (Spanner.CHORD, Spanner.MEASURE, Spanner.NOTE, Spanner.SEGMENT) |
| endElement | Element | the element the spanner end is anchored to (read-only) |
| startElement | Element | the element the spanner start is anchored to (read-only) |
| tick | int | tick start position |
| tick2 | int | tick end position |