Re: Purpose of backend (export=yes)

[Hans Hagen <pragma@wxs.nl>]

On 8-11-2010 3:52, Vladimir Lomov wrote:

> I compiled them with context (mkIV, context minimal) and got
> ex{1,2,3}.export. I thought that I get not only the document content but
> also its logical structure (for example some markup for font switching).

Bold in itself is not structure so best tag it as (e.g.) important:

\setupbackend[export=yes]

\definestartstop[important][style=bold]

\starttext

This is second example.
This time we try to use font switching mechanism:
This is normal, but this \important{one is bold}. Normal again.

\stoptext

> Is it true that 'backend' only output document content not its logic
> strcuture? Does it work with math? The third example gives for math only
> not letters.

Math becomes:

  This is inline formula
   <math>
     <mrow>
       <mi>𝐸</mi>
       <mo>=</mo>
       <mi>𝑚</mi>
       <msup>
         <mi>𝑐</mi>
         <mn>2</mn>
       </msup>
     </mrow>
   </math>
.
   <break/>
  This is display formula
   <formula>
     <formulacontent>
       <math>
         <mrow>
           <mi> 𝐸</mi>
           <mo>=</mo>
           <mi>𝑚</mi>
           <msup>
             <mi>𝑐</mi>
             <mn>2</mn>
           </msup>
         </mrow>
       </math>
     </formulacontent>
   </formula>

> I attached the resulted export files.
>
> P.S. Then I saw the announce about 'backend'&  'export=yes' I thought
> that context would be good tool for notes. I imagine that I could wrote
> a text file and make from it either pdf (for printing/screening) or html
> (for screening) or may be convert xml (using existing tools and
> methods) to other formats (rtf/odt/xhtml) that would contain math,
> images, tables. But seems that I was wrong or this will be in future
> of the backend?

indeed it should be possible to use context that way and afaik the 
export is already quite okay (you might need a recent luatex as there 
have been issues with attributes in math mode that were sorted out a 
while ago)

Hans

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