Meiyo Peng reports at <https://lists.gnu.org/archive/html/guix-devel/2019-05/msg00275.html>

On Tue, May 14, 2019 at 10:29:35AM +0800, Meiyo Peng wrote:
> I just find out that the @pxref{Packages with Multiple Outputs} in
> doc/contributing.texi has to be translated.  Or I will get an error
> while running make:
> 
> #+begin_example
>   doc/contributing.zh_CN.texi:567: @pxref reference to nonexistent node `Packages with Multiple Outputs'
> #+end_example
> 
> I guess it's because the node name is in doc/guix.texi (another file
> than doc/contributing.texi).  Any idea?
> 

The reason appears to be that when not translating (using the first
attached patch that reverts back to @pxref{Packages with Multiple
Outputs}), po4a-translate transforms

@item
Take a look at the profile reported by @command{guix size}
(@pxref{Invoking guix size}).  This will allow you to notice references
to other packages unwillingly retained.  It may also help determine
whether to split the package (@pxref{Packages with Multiple Outputs}),
and which optional dependencies should be used.  In particular, avoid adding
@code{texlive} as a dependency: because of its extreme size, use
@code{texlive-tiny} or @code{texlive-union} instead.

to

@item
看一下@command{guix size}（@pxref{Invoking guix
size}）的分析报告。这会让你注意到对其它软件包无意中的引用。它也可以帮助决定是否要把一个软件包分割成几个输出（@pxref{Packages
with Multiple
Outputs}），以及需要使用哪些可选的依赖。特别地，避免把@code{texlive}添加为依赖：因为它太大了，请使用@code{texlive-tiny}或@code{texlive-union}代替它。

with the pxref split over three lines because the surrounding context
has no space characters.  doc/local.mk’s xref_command can only deal
with two lines however.

The second attached patch makes xref_command grep three-line
references too, so it finds the translation, *however* I cannot get
this multiline sed to actually insert the translation into three line
references.  Perhaps it would be better to just replace this complex
xref_command with Guile code?  I will not do it however.

I am Cc’ing the bug-guix@gnu.org; I hope this is OK.

Regards,
Florian