I will have to find Lajacki's description of how his versioning worked, but you have the right general idea. Small changes like a error correction, got a number change in the third place from right of the decimal point. A bunch of new words, a change in grammar, etc. got a change in the second place. A major shift n something got a change in the first place. A wholesale reworking got a change on the number to the left of the decimal point. Those kinds of changes got to be rare after we had a reasonably good understanding of the grammar, etc. So, the Na'vi dictionary has ben on version 11.xxx for quite some time now. (The current version is 11.87, the last with Taronyu/Lajaki as editor). Above all, it is not rocket science.