[NTG-context] Learning how to use \setupbtxrendering

Rik Kabel context at rik.users.panix.com
Mon Feb 19 00:49:30 CET 2018

On 2018-02-18 16:05, Rik Kabel wrote:
> On 2018-02-18 15:25, Wolfgang Schuster wrote:
>>> Rik Kabel <mailto:context at rik.users.panix.com>
>>> 18. Februar 2018 um 21:06
>>> On 2018-02-18 14:33, Wolfgang Schuster wrote:
>>> It does not matter how many fonts support both (LM does, and 
>>> Libertine). One feature of a BibTeX file is reusability for many 
>>> documents, and when the file is created you do not know what will be 
>>> the default emphasis of the document. By explicitly coding \it, you 
>>> are assured that the italic face will be attempted. If it is not 
>>> available, there should be an error message, and you can then have a 
>>> discussion with your editor. The claim of the new bibliography 
>>> subsystem is that it will implement APA strictly, and that calls for 
>>> italic.
>>> I understand as well that \em allows switching (reverse emphasis as 
>>> noted above). It also provides some italic correction. I am asking 
>>> about the appropriate use of the two variations of \em: \emph  
>>> (which is a grouped command \em) and \emphasized (defined as 
>>> \bgroup\em\let\nexttoken). I understand and make use of grouped 
>>> commands -- they are largely syntactic sugar, but I like sugar. I am 
>>> less certain of the purpose of \emphasized, how it works, and why it 
>>> might be useful. I do not recall seeing a command definition with a 
>>> bgroup and no egroup before.
>> \em -> {\em ...}
>> \emph -> \emph{...} or {\emph ...}
>> \emphasized -> \emphasized{...}
>> Wolfgang
> Yes. \em is a font switch. \emph can be either a command or a font 
> switch. \emphasized is only a command. But why have \emphasized? Under 
> what circumstances would a casual user prefer it? Under what 
> circumstances a more advanced user, or someone writing a module, 
> employ it? What does it do differently than \emph used as a command?
> Grepping the source, I see thirty or so occurrences of the pattern 
> \bgroup...\let\nexttoken. I do not understand just what it does. Can 
> you explain it, or direct me to a good place to learn about it?

Okay, with some off-list help and a bit more reading, I understand the 
pattern used in the definition of \emphasized, or at least how it works. 
I still do not know when it should be preferred. I suspect it is more 
efficient than \emph. Is that the only advantage?

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