On 31/12/2008, at 7:29 AM, Frank Mittelbach wrote:

> So I personally would go KISS and offer
> functions that limit the accepted input to balanced token lists  
> without #.

Another random thought: since users "shouldn't" be defining new macros  
within the body of their documents, I think LaTeX3 should have  
something like the equivalent of
   \AtBeginDocument{\catcode`\#=12}

Of course, there could be markup to allow them to write more  
definitions mid-document if they really want/need.

* * *

But that's rather separate from what we've been talking about :)

It seems to me that the two most plausible options (if we do anything)  
are to change tlp->tlist or tlist->toks depending on how robust we can  
make the inline functions. Can we be guaranteed that all (what is  
currently now) \tlist_ functions can deal gracefully with # tokens?

Alternative: use tlp->tlist regardless and say that tlist functions  
that take inline arguments are generally more robust with # tokens  
than saving data to a tlist pointer. (Since I kind of like the =tlist=  
name. Wishy-washy, I know.)

* * *

Also, is there a way that the naming of the \token_ module can be  
incorporated into our naming scheme above? Or is that stretching  
things too far? (My current feeling is that it is.)

Will