Dear All,

the attached patch adds support for filter-based sub-bibliographies in the "csl"
org-cite export processor. It supports the same syntax for specifying
filters as the biblatex processor and supports some of the biblatex
filter types, concretely, entry-type and keyword based filtering. It
also supports filtering based on CSL type (as opposed to bib(la)tex
type) and using any Lisp predicate as a filter.

best wishes,
András