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

[Jim Campbell <jwcampbell@ubuntu.com>]

Hi there, Chris,

On Wed, Oct 13, 2010 at 9:16 AM, chris snow <chsnow123@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