Hi everyone,

I am attempting to map some XML into ConTeXt as described in the manual 
"XML in ConTeXt".  Essentially we have a bunch of tagged text (the XML 
"loosely" based on some of the  XHTML tags) from which we want to produce 
PDF letters for dispatch (via email, post etc). 

I am having particular problems implementing the following commands: -
        \underbar, \underbars, \overstrike, \overstrikes, \low, \high and 
\lohi

I was expecting that they would all easily be defined using the 
\defineXMLgrouped [name] {command} element mapping. There is probably 
something very simple that I have not setup correctly since I am sure that 
this has been attempted before and would appreciate pointers as to where I 
am going wrong.

The following attempts at mapping element <u> to \underbar illustrates my 
problem which also seems largely applicable to the <strike>, <sub> and 
<sup> mapping: -

1.  This def of <u> does nothing ...
\defineXMLgrouped [u] \underbar

2.  This def of <u> also does nothing ...
\defineXMLgrouped [u] {\groupedcommand{\underbar}{}}

3. This def of <u> underlines the 1st character only ...
\defineXMLenvironment [u] {\bgroup\underbar} {\egroup}

4. In the mailing list, there is a suggestion that  \underbar does not 
allow line-breaking, so I also tried the following.  This def of <u> 
"works" partially, in that it does underline, however it causes havoc with 
alignment - everything seems to shift over to the right about 4cm ...

\defineXMLenvironment [u] \startul \stopul
\definetextbackground[ul]
  [location=text,alternative=1,background=,frame=off]

\definestartstop[ul]
    [before={\starttextbackground[ul] },
        after={\stoptextbackground\ }]


Below is a sample  .tex file that I have been playing with: -

\usemodule        [contml]
\autoXMLnamespace [context]

% Attempts at defining a mapping for <u>: -
% This def of <u> does nothing ...
%\defineXMLgrouped [u] \underbar
% This def of <u> does nothing ...
%\defineXMLgrouped [u] {\groupedcommand{\underbar}{}}
% This def of <u> underlines the 1st character only ...
%\defineXMLenvironment [u] {\bgroup\underbar} {\egroup}
%
% This def of <u> "works" partially, in that it does underline, however it
% causes havoc with alignment - everything seems to shift over to the 
right
% about 4cm ...

\defineXMLenvironment [u] \startul \stopul
\definetextbackground[ul]
  [location=text,alternative=1,background=,frame=off]

\definestartstop[ul]
    [before={\starttextbackground[ul] },
    %    after={\stoptextbackground\fixedspaces}]
        after={\stoptextbackground\ }]

% Other mappings
\defineXMLgrouped [right]  \rightaligned
\defineXMLgrouped [centre] \midaligned
\defineXMLgrouped [em] \em
\defineXMLsingular [br] [nr=1]
    {\blank[\XMLop{nr}*medium]}

\showstruts \showframe

\starttext

start of 'normal' \CONTEXT\ text

\underbar{This} is {\em left} aligned
\blank[medium]
\rightaligned{\underbar{This} is {\em right} aligned}
\blank[medium]
\midaligned{\underbar{This} is {\em centre} aligned}

end of 'normal' \CONTEXT\ text - starting xml ...

\startXMLdata

<p>This is <em>left</em> aligned</p>

<p><centre><u>This</u> is <em>centre</em> aligned</centre></p>

<p><centre>This is <em>centre</em> aligned</centre></p>

<p><right>This is <em>right</em> aligned</right></p>

\stopXMLdata
\blank[medium]
finished xml - back in 'normal' \CONTEXT\ text
\stoptext



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