i=initial, m=medial, t=terminal. Number is used to match endpoints of the slur when slurs are nested or overlap, e.g. <note slur='i1 i2'/><note slur='t1'/><note slur='t2'/> encodes the fact that two slurs begin on note 1, one which terminates on note 2 and one which terminates on note 3.
Module MEI
Used by
<rng:data type="token">
<rng:param name="pattern">[i|m|t][1-6]</rng:param>