Requires: CL-PPCRE

Installation:

(asdf-install:install :html-entities)

Usage:

(asdf:oos 'asdf:load-op 'html-entities)

(defparameter str "some text <which needs \"encoding\"!> & decoding")

(let ((encoded (encode-entities str)))
  (decode-entities encoded))

(More documentation)

Patches and suggestions welcome!