Understanding some aspects of the philex package

Question

In Philex, you can refer locally to an example (2b) by just typing \rnx{label} and it will return just (b), otherwise just type \rn{label} and it returns (2b).

Here is the syntax of the two commands:

\newcommand{\rf}[2][]{%%
\ifhyperref%%
(\hyperlink{#2}{\csname#2\endcsname}#1)%
\else%%
(\csname#2\endcsname#1)%
\fi}
%Cross-reference to subsentence without main number:%
\newcommand{\rfx}[2][]{%
\ifhyperref%
(\hyperlink{#2}{\csname#2q\endcsname}#1)%
\else%
(\csname#2q\endcsname#1)%
\fi}

As you may know, when referring to subsubexamples such as (1a.i), I'm looking for a way to also skip the sublevel and return just (i),

• which is possible thanks to Ulrich Diez's solution as found here:
  • Any way to reference a particular component of a label?
• but only works if there is a separator;
• cf. my post here Local cross-referencing with Linguex/Philex and Cleveref: Skipping 1st and 2nd level sublabels ...
• and cf. my larger concern here Cross-referencing: more sublevels, and presets.

My question is quite straightforward. I would like to know what \csname#2q actually does, so I can use it to also skip the sublevel label, without having to worry about the presence of a delimiter as in Ulrich's \gobbletodot suggestion.

Edit

I found this line :

\refstepcounter{altsub}\label{#2q}

So this is only a label for the sublevel.

But then we find :

\refstepcounter{altsubsub}\label{#2q}

So the problem is that #2q is one and the same label for the sub- and subsub- levels.

I guess the way the package is written, I could not refer to the sublabel and only keep the subsublabel.