Ambiguous f. (forma or filius) needs a warning

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/57

Sometimes it is impossible to say just by looking at a name-string, if f. in it belongs to an author as filius(son of) or it belongs to the following epithet and designates its rank as forma:

Aus bus L. f. cus

We decided that we create less damage, if we associate f. with author as filius, than potentially creating a wrong rank for the infraspecific epithet. However we do not explicitly say that there is an ambiguous situation. We need to create a new level 2 warning "Ambiguous f. (forma or filius)" for such occasions.

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/43

mentioned in issue #63

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/44

closed

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/45

I am closing this ticket again, and opening a new one about changing fm. to f.

[dimus]

created by @gdower at https://gitlab.com/gogna/gnparser/-/issues/46

Yuri thinks keeping f. as forma and changing filius to fil. would be a good solution. Alternatively, maybe form. could be used for forma? Although form. is also non-standard, the meaning might be clearer than fm.

I can also easily just convert fm. back to f. for CoL+ if you prefer to keep it that way.

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/47

reopened

[dimus]

created by @dimus at https://gitlab.com/gogna/gnparser/-/issues/48

I decided not to go with form or forma because they do not end with period, and that makes it harder to distinguish them from species epithets. It is also less future proof, as some authors get "adventurous". For example there is a species epithet spec!

I guess one thing we can do is to keep forma as f. but change filius to fil.?

[dimus]

created by @gdower at https://gitlab.com/gogna/gnparser/-/issues/49

@dimus, instead of standardizing forma to an fm. abbreviation, Yuri suggests that gnparser should disambiguate the rank to forma, because the fm. abbreviation is seldom used and may not be recognized. Paddy suggests using form, which might be a reasonable compromise.