O Oriens, splendor lucis aeternae, et sol iustitiae: veni, et illumina sedentes in tenebris et umbra mortis.
Apart from those sort of nouns/substantives, I can't find an example of a present participle as a vocative.
Usually the present participle qualifies "tu" in the nominative where there is a vocative near.
Junya wrote:Then, is it possible that a pres. part. in voc. is attached to a hiding noun in vocative ?
Sumens illud «Ave»
funda nos in pace,
mutans Evæ nomen.