Re: [docbook] how to throw error if imagedata not found

[Jim Campbell]

Hi there, Chris,

On Wed, Oct 13, 2010 at 9:16 AM, chris snow <chsnow...@gmail.com> wrote:

> Is it possible for an error to be thrown during processing if a file
> referred to by imagedata is not found?
>
>    <mediaobject>
>      <imageobject>
>        <imagedata fileref="../../images/coding-cycle.png"/>
>      </imageobject>
>    </mediaobject>
>
> Many thanks,
>
> Chris
>
> It might not be exactly what you are looking for, but one option would be
to include the image via an xinclude mechanism, and then include a xinclude
fallback.  It might go something like this:

   <mediaobject>
     <imageobject>
       <xi:include fileref="../../images/coding-cycle.png">
         <xi:fallback>Image file is unavailable.</xi:fallback>
       </xi:include>
     </imageobject>
   </mediaobject>

You would need to use a DTD or schema (or at least a DTD fragment) that
allows for use of xinclude.

I hope this helps,

Jim