> by definition, Dave Pawson is not using Lite, 'cos he is doing
Indeed; the point was intended for wider consumption.
> > At the WWP, the value of rend= that we would use is "sub()".
> why ... rend="sub()" and not rend="sub", out of interest?
The WWP rendition ladders require that all keyword arguments be
delimited by parenthesis primarily to try to make them easy to parse.
I'm not sure I've succeeded, but that was the goal. Part of the logic
went: "anyone who is writing software to handle a TEI document must
have a routine capable of parsing location ladders; if we make the
value of rend= look the same, some of the same software could be used
to parse (what we then decided to call) rendition ladders".
> > ... you could use the supplied TEI mechanism:
> > <!NOTATION TeX PUBLIC ...>
> > ...
> > <formula notation="TeX">C$_2$H$_5$OH</formula>
> which would ... be retrograde. the TeX notation is
> *presentational*, as bad as <hi rend="sub">2</hi>.
Actually in some ways a bit worse. In order for someone to figure out
what the above representation of ethanol should look like (let alone
what it *is*), she would have to not only know the SGML/TEI notation
system, but also would have to know something about TeX. Luckily TeX
happens to be ubiquitous now, but there's no reason to stake the
future of your data on that detail.
On the other hand, even though it is presentational and requires
knowledge of an outside system (in this case TeX), it does have the
advantage that it is a method that a) confesses its dependencies
right up front (the NOTATION declaration goes in the document type
declaration subset at the top-of-file), and b) conforms to the
> Please lets NOT pretend that TeX is a good abstract markup for math
> - its a good *presentation-based* markup for math
In case I left anyone with the impression that I was promoting TeX
(or any other such text formatting language) as an abstract markup
language, I was not. I considered my example not too far removed from
<!NOTATION PNG SYSTEM "image/png">
NDATA PNG >
In the latter case the processing software needs to know how to
resolve a binary file into an image ala Portable Network Graphics
format, and in the former it needs to know how to resolve text data
into an image ala TeX format.
P.S. In the above example I used the MIME type as the external ident-
ifier of the notation declaration. Should I have used PUBLIC
instead of SYSTEM?
 We (the WWP) have never formally made the rendition ladder
system public for two reasons:
- we (OK, *I*) still have to iron out a few rough spots
before it's a coherent system;
- others have made parts of it public, anyway. See
 If you don't know what a location ladder is (I know you do,
Sebastian; again, intended for the wider audience) go read <xref
doc="p3.p3x" from="id(SAxr)">Chapter 14.2, "Extended Pointers,
pp. 405-424 (of the big green books),
http://www.tei-c.org/Guidelines/SA.htm#SAXR</xref> The TEI
extended pointer system provided large part of the basis for the
W3C XPath language (http://www.w3.org/TR/xpath).
-- Syd Bauman, EMT-Paramedic
SGML & XML programmer / analyst
Brown University Women Writers Project
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