In a guitar chord diagram, a label indicating which finger, if any, should be used to play an individual string. The index, middle, ring, and little fingers are represented by the values 1-4, while 't' is for the thumb. The values 'x' and 'o' indicate stopped and open strings, respectively.
Module MEI
Used by
<rng:data type="positiveInteger">
<rng:param name="minInclusive">1</rng:param>
<rng:param name="maxInclusive">4</rng:param>
<rng:data type="token">
<rng:param name="pattern">x|o|t</rng:param>