Man pages matching name rdf::aref::encoder in section 3pm:

RDF::aREF::Encoder.3pm.en	debian 10 / librdf-aref-perl
RDF::aREF::Encoder.3pm.en	debian 11 / librdf-aref-perl
RDF::aREF::Encoder.3pm.en	debian 12 / librdf-aref-perl