Issue/2398/Embedded deferred ask category format query

{{#ask:
 [[Category:Book]]
 [[Has book title::+]]
 |?Has book author=author
 |?Has book publishing year=year
 |?Has book ISBN=ISBN
 |?Has book rating=rating
 |mainlabel=title
 |sort=Has book publishing year, Has book author
 |order=descending,asc
 |class=datatable
 |link=all
 |@deferred
 |format=category
}}