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Date:         Thu, 13 Aug 2009 11:42:35 +0930
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From: Will Robertson <wspr81@GMAIL.COM>
Subject: Re: remarks on expl3.pdf
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Dear all,

On 13/08/2009, at 11:27 AM, Will Robertson wrote:

>> IMO, it is certainly ok to keep the terminology, but adding  
>> warnings that
>> sometimes it doesn't actually fit the reality, but is only intended  
>> to simplify
>> reading. (Either a big general warning, or small foonotes in well- 
>> chosen places,
>> or both.)
>
> I'll try and work something into source3.

A few minutes before lunch yields:

> \subsubsection{Terminological inexactitude}
>
> A word of warning. In this document, and others referring to the  
> \pkg{expl3}
> programming modules, we often refer to `variables' and `functions'  
> as if
> they were actual constructs from a real programming language.
> In truth, \TeX\ is a macro processor, and functions are simply  
> macros that
> may or mayn't take arguments and expand to their replacement text.
> Many of the common variables are \emph{also} macros, and if placed  
> into the
> input stream will simply expand to their definition as well~--- a  
> `function'
> with no arguments and a `token list variable' are in truth one and  
> the same.
> On the other hand, some `variables' are actually registers that must  
> be initialised and their values set and retreived with specific  
> functions.
>
> The conventions of the \pkg{expl3} code are designed to clearly  
> separate the
> ideas of `macros that contain data' and `macros that contain code',  
> and a consistent wrapper is applied to all forms of `data' whether  
> they be macros or actually registers.
> This means that sometimes we will use phrases like `the function  
> returns a value', when actually we just mean `the macro expands to  
> something'. Similarly, the term `execute' might be used in place of  
> `expand' or it might refer to the more specific case of `processing  
> in \TeX's stomach' (if you are familiar with the \TeX{}book parlance).
>
> If in doubt, please ask; chances are we've been hasty in writing  
> certain definitions and need to be told to tighten up our terminology.

WDYT?
(I'm not worried about red pen.)

Will
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