How to set equation numbers in lining numerals?

I'm using XeLaTeX with Linux Libertine (using fontspec) and oldstyle numbers. I'd like, however, to set equation numbers (using amsmath's \eqref) in lining numbers. This does not work:

\renewcommand{\eqref}[1]{\textup{\Lpnum{\tagform@{\ref{#1}}}}}


In other circumstances, the \Lpnum macro does work. Any ideas?

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\tagform@=macro:
#1->\maketag@@@ {(\ignorespaces #1\unskip \@@italiccorr )}.
l.5 \show\tagform@

? > \maketag@@@=macro:
#1->\hbox {\m@th \normalfont #1}.
l.6 \show\maketag@@@


so you probably want to invert the order of

 \Lpnum{\tagform@{


to

 \tagform@{\Lpnum{


so that you get choose the font actually used.

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I'm impressed, both by the accuracy and speed of your answer! Thanks, it works! –  mbork Apr 4 '12 at 15:48
ah that was a good guess, I didn't test as I don't know enough about xelatex to load up the fonts:-) –  David Carlisle Apr 4 '12 at 16:07