[osis-core] Syntax for osisWork

[Harry Plantinga]

> Not sure if we want to go there but could add an element in the header 
> to hold work declarations with a full set of attributes for all those 
> things. Then osisRef and cite could simply refer to the ID of that item 
> in the header for such information.
> 
> <osisReferences>
>     <work ID="A1" title="" edition="" lang="" version="" date="" />
> </osisReferences>

I think this would be a good idea. 

The editing software ought to be able to generate a bibliography
and citation markers as well.

Should it be possible to specify the following?
  - URI 
  - ISBN, ISSN