To go back to Anton's original posting, where he quoted
Eric Raymond:
As an example: In a presentation-markup lan-
guage, if you want to emphasize a word, you
might instruct the formatter to set it in
boldface. In troff(1) this would look like
so:
All your base
.B are
belong to us!
In a structural-markup language, you would
tell the formatter to emphasize the word:
All your base <emphasis>are</emphasis> belong to us!
The "<emphasis>" and </emphasis>in the line
above are called markup tags, or just tags
for short. They are the instructions to your
formatter.
In a structural-markup language, the physi-
cal appearance of the final document would
be controlled by a stylesheet . It is the
stylesheet that would tell the formatter
"render emphasis as a font change to bold-
face". One advantage of structural-markup
languages is that by changing a stylesheet
you can globally change the presentation of
the document (to use different fonts, for
example) without having to hack all the the
individual instances of (say) .B in the doc-
ument itself.
On the lines that others have since pointed out, one can
emulate the "<emphasis>are</emphasis>" (with definitions
in a "stylesheet") straightforwardly in groff:
.\"Stylesheet definitions:
.ds emph \fB
.ds /emph \fP
.\"..........................
All your base \*[emph]are\*[/emph] belong to us!
You could define \*[emph] as \fI (plain italic), or as \f[BI]
(bold italic), etc.
On that basis, I think (though I may have misunderstood the
distinction Eric Raymond want to make between presentation-markup
and structural-markup) that it comes to much the same thing!
However, in certain contexts one may wish to underline instead,
which gets more complicated in groff (and would be defined in
macros rather than in strings). Then its implementation would
look different, though it stills seems to be to come to the
same thing.
Best wishes to all,
Ted.
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E-Mail: (Ted Harding) <ted.hard...@wlandres.net>
Date: 03-May-2012 Time: 23:13:25
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