Wikidata property values are effectively retrieved by #property inclusion
syntax, but it work only when used into the wikisource page directly linked
to a wikidata element.
An effective management of a "book" (best, a literary work) needs creation
of two different elements ("work" and "edition"); ns0 wikisource pages
can
be linked to "edition" wikidata element just as Author: pages are linked to
author's wikidata element; on the contrary, presently there's no wikisource
page that could be linked to "work" wikidata element, so the data of the
latter can't be retrieved into wikisource by #property inclusion syntax.
I'm testing a strange idea: to create wikisource "work" pages as subpages
of author's page. It seems a nonsense location, but it has a long series of
advantages and few disadvantages IMHO:
* omonimies decrease sharply;
* there's a logical and implicit link between author and his works;
* work pages can be very simply self-categorized as [[Category:Works by
{{BASEPAGENAME}}]]
* joining {{#property:...}} and {{subst:#property:...}} codes, such work
pages both show data and run as templates to access the data from any other
page.
* the code can be completely standardized and can be easily created/updated
by bot, simply posting the same base code into any work page, new or old.
Tests are going on working using
https://it.wikisource.org/wiki/Autore:Silvio_Pellico and its related
wikidata elements.
Alex brollo