The commentary was updated.
http://www.lojban.org/tiki/tiki-index.php?page=gadri%3A+an+unofficial+commentary+from+a+logical+point+of+view&no_bl=y
I made corrections according to comments of la xorxes.
I added "Section 3.2.2. Bound variables and constants in a statement" according to my response to Martin Bays, as well as "Section 3.4. Relation between jo'u, joi, ce and gadri" including the Lojban definitions of JOI in BPFK Sections recently modified (ki'e la ilmen).
Any comments will be appreciated.