The xs:token data type

Where is this type used?

<barline> — segno attribute

<barline> — coda attribute

<bass-step> — text attribute

<bookmark> — name attribute

<creator> — type attribute

<credit-image> — type attribute

<degree-type> — text attribute

<degree-value> — text attribute

<encoder> — type attribute

<feature> — type attribute

<first-fret> — text attribute

<frame> — unplayed attribute

<grouping> — number attribute

<grouping> — member-of attribute

<image> — type attribute

<inversion> — text attribute

<kind> — text attribute

<link> — name attribute

<lyric> — name attribute

<lyric-font> — name attribute

<lyric-language> — name attribute

<measure> (partwise) — number attribute

<measure> (timewise) — number attribute

<miscellaneous-field> — name attribute

<numeral-root> — text attribute

<other-appearance> — type attribute

<other-listen> — type attribute

<other-listening> — type attribute

<other-play> — type attribute

<part-group> — number attribute

<print> — page-number attribute

<relation> — type attribute

<rights> — type attribute

<root-step> — text attribute

<score-partwise> — version attribute

<score-timewise> — version attribute

<sound> — segno attribute

<sound> — dalsegno attribute

<sound> — coda attribute

<sound> — tocoda attribute

<sound> — fine attribute

<supports> — value attribute