Square brackets and subscript in expex glossing

Question

I'm new to Latex and trying to figure out how to do the following thing with expex: I would like to use square bracket as well as a subscripted word such as 'NP' in the transcription line, where everything else is italic and glossed. Something like this (with the NP subscripted):

[my dog]NP ate me.

1SG.POSS dog eat.PST 1SG.ACC

Answer 1

The expex package provides a \nogloss macro to exempt certain elements from being counted as in the gloss. I've made two bracketing macros to create upright brackets: \lb creates an upright left bracket, and \rb{XP} creates an upright right bracket with a label "XP".

Unfortunately, due to the way expex is written, you can't include the \nogloss command inside the \lb and \rb macros, so they need to be used explicitly.

\documentclass[12pt]{article}
\usepackage{fixltx2e} % This package not needed for > 2015 distributions 
\usepackage{expex}

\newcommand{\lb}{\upshape[}
\newcommand{\rb}[1]{\upshape]\textsubscript{#1}}

\begin{document}
\ex
\begingl
  \gla \nogloss{\lb}  Mon ami \nogloss{\rb{NP}}     est  \nogloss{\lb} grand \nogloss{\rb{AP}}//
  \glb my friend is tall//
  \glft `My friend is tall'//
\endgl
\xe
\end{document}

Answer 2

I like to use philex with fixltx2e, but I think, that you can combine it with your expex code.

\documentclass{article}
\usepackage{philex}
\usepackage{fixltx2e}
\begin{document}
\lb{ex2}{\gll [my dog]\textsubscript{NP} ate me.\\
1\textsc{sg}.\textsc{poss} dog eat.\textsc{pst} 1\textsc{sg}.\textsc{acc}\\}
\end{document}