What about providing a value for the "type" attribute of element <q>?
And nest that within the <note type="incipit"> ?

<note type="incipit">The chapter starts on <locus>fol. 333</locus> with
<q type="incipit">Hier hebet an</q>.</note>

These semantically would be noted and quoted incipits which are not the
same as the incipit proper (about which there was a thread in the last few
months or so -- check the archives).

Francois Lachance, Scholar-at-large

2005 Year of Comparative Connections. DIA: Comparative connections? LOGZ:
Connection, first. Comparison, next. DIA: Check. Comparable ways of
connecting. LOGZ: Selection outcomes, first. Comparative Connections,