Wei-Wei Guo wrote:
Hi Taco,
I just finished reading the 'System_Macros'. I still don't get the meaning
of '\??pb @lang@' in the following codes:
\def\lang#1%
{\def\biblanguage{#1}%
\ifcsname \??pb @l...@#1\endcsname
\expanded{\mainlanguage[\getvalue{\??pb @l...@#1}]}%
\expanded{\language[\getvalue{\??pb @l...@#1}]}%
\fi \ignorespaces}
In \lang[zh], for example, '\??pb @lang@' will be expanded to \@@pblangen,
will it? Is \??pb a command? Is '\??pb @lang@' a command? Why can there be
a whitespace in '\??pb @lang@'?
\??pb creates a namespace so you cannot mess with it in your document
easily
\??pb is just a macro and the ?? makes it kind of private (hidden)
there has to be a whitespace otherwise you'd call for \?...@lang@
Sorry for some many questions. I'm so confused and don't know what to
search in wiki, manuals, etc..
this is not stuff most users want to know or see; add a few
\expandafter's, \futurelet's and \afterassignments and one wonders in
what universe one has ended up
Hans
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