Images do not extract to epub OPF manifest - solved

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  MicrosoftInternetExplorer4
  
   
   
   
   
   
   
   
   
   
   
   
  

Hi all,

I have found the 
problem with image filenames not appearing
in the OPF manifest. 

 

For each figure, I had one mediaobject containing two imageobjects:
each imageobject had a role attribute to allow selection of the image for
different output – one with role=”fo” and the other with 
role=”xhtml”. When I
split each imageobject into its own mediaobject, the image filename appeared 
in
the manifest. So when transforming to epub, the rule is: separate 
mediaobjects
for each image in the XML. 

 

This is a trap: having multiple imageobjects in one
mediaobject still produces valid XML. It also allows FO, XHTML and epub
transformations without showing any errors. The images appear correctly in 
the
resulting XHTML pages. I am sure you could create a valid epub like this 
too,
but it would obviously be missing metadata. 

 

Maybe the epub transformation should fail if the DocBook
markup does not satisfy the test of there being separate 
“mediaobject/imageobject/imagedata”
for each image, because it would be missing metadata.

 

Thanks,

Dave Gardiner