ExPex labeling does not support \ref{}erencing properly

[chbrown]

References to ExPex examples ignore (are not told about) changes to the exnotype configuration parameter:

\documentclass[expex]{sp}
% the expex class option sets \lingset{exnotype=roman} inside footnotes
\begin{document}

Outer paragraph.\footnote{N.b. the example in (\ref{fn:1i}):
\ex \label{fn:1i}
  Example text
\xe
}

\end{document}

Produces:

[...]