Generally, however, the texts are collected in a few very fat volumes with small print. The Japanese Taisho version of the Chinese Tripitaka is some 50 volumes each a thousand-1500 pages or so long, as I remember. Take you a life time to read all that carefully. Editions is not the correct word, versions would be better. These are above all by language.
Some later printings add works missed in earlier printings, etc.
The Taisho Tripitaka, for example, includes an appendix of such material. There is no religious committee deciding what to include. It is an editorial decision only. No Church councils are, however, involved in the decision. Laymen generally support such publication since it is a meritorious act.