On grammatical class:

vu'o
joins relative clause/phrase to complete complex or logically connected sumti in afterthought.

In definition:

cmavrvu'o
x1 is the selma'o "VUhO".

In notes:

sumtika
x1 is a part of Lojban text representing rule 'sumti' according to the first edition of the book 'The Complete Lojban Language'.