alastair/pymei — comment on commit 43d54518180204afc21de4a039b44dae2e52140f
File: pymei/Components/MeiDocument.py line 147
By alastair:

Hmm, I'm not sure why this commit is still here. I did a force push. New commit is b0998fd37224a1187fbbeecebcc11fe6ea7bbc2a
The lxml parser throws an exception on load if there's duplicate IDs, so we only need to consider the case where there's 0 (if not els) or 1 (else) item in the list