On grammatical class:
- elidable terminator: right parenthesis/end unquote; seldom elidable except at end of text.
- x1 is the selma'o "TOI".
- marks a construct as being a reference/allusion - explicit marker of divorce/isolation of a construct from any external allusions that may come to mind
- x1 is a part of Lojban text representing rule 'free' according to the first edition of the book 'The Complete Lojban Language'.