The xs:ID data type

Where is this type used?

<accidental-mark> — id attribute

<accordion-registration> — id attribute

<arpeggiate> — id attribute

<articulations> — id attribute

<barline> — id attribute

<beam> — id attribute

<bookmark> — id attribute

<bracket> — id attribute

<clef> — id attribute

<coda> — id attribute

<credit> — id attribute

<credit-image> — id attribute

<credit-symbol> — id attribute

<credit-words> — id attribute

<damp> — id attribute

<damp-all> — id attribute

<dashes> — id attribute

<direction> — id attribute

<direction-type> — id attribute

<dynamics> — id attribute

<eyeglasses> — id attribute

<fermata> — id attribute

<figured-bass> — id attribute

<for-part> — id attribute

<frame> — id attribute

<glissando> — id attribute

<grouping> — id attribute

<harmony> — id attribute

<harp-pedals> — id attribute

<image> — id attribute

<key> — id attribute

<lyric> — id attribute

<measure> (partwise) — id attribute

<measure-style> — id attribute

<measure> (timewise) — id attribute

<metronome> — id attribute

<non-arpeggiate> — id attribute

<notations> — id attribute

<note> — id attribute

<octave-shift> — id attribute

<ornaments> — id attribute

<other-direction> — id attribute

<other-notation> — id attribute

<pedal> — id attribute

<percussion> — id attribute

<player> — id attribute

<principal-voice> — id attribute

<print> — id attribute

<rehearsal> — id attribute

<scordatura> — id attribute

<score-instrument> — id attribute

<score-part> — id attribute

<segno> — id attribute

<slide> — id attribute

<slur> — id attribute

<sound> — id attribute

<staff-divide> — id attribute

<string-mute> — id attribute

<symbol> — id attribute

<technical> — id attribute

<tied> — id attribute

<time> — id attribute

<transpose> — id attribute

<tuplet> — id attribute

<wedge> — id attribute

<words> — id attribute