There are repeated notes in the melismas. Other than these features, the general principles for setting texts in a 16th century style are the same as for most other styles of music. You will find, however, that the principles are followed very strictly. The first syllable is on a single note. The first leader in a composition begins on the first beat with a dotted half note or longer duration.
Subsequent leaders begin with any white note on any beat.
The final syllable is on a single note. As in this example, note that black notes are primarily reserved for melismatic passages. Melismatic passages end with a white note. When a syllable is set to a single note, it is almost always a white note. Note the leader in mm 1-2 on p74.