Does FOP 2.1 support ViewerPreferences?

Question

I\'m using FOP 2.1 and am trying to set ViewerPreferences, e.g. DisplayDocTitle -> true.

I\'m trying (from this question

Answer 1

According to the release notes FOP 2.0 introduced, among other things, a

• Low level mechanism to augment PDF /Catalog and /Page dictionaries

but there are not many examples of its usage in the website.

Looking at the testcases included in the source distribution, in particular the ones named pdf-dictionary-extension_*.xml, I was able to put together something similar to your code which does not generate run-time exceptions; admittedly, I'm not familiar enough with this PDF feature to say whether the output actually achieves what you are trying to do:

  
    
      true
    
  

• there is no , there is pdf:catalog instead
• there is not a single element, but there is a specific element for each possible entry type: pdf:array, pdf:boolean, pdf:name, pdf:number, pdf:string, ...

(disclosure: I'm a FOP developer, though not very active nowadays)