In this paper we present our results on the exploration of the design space of a declarative framework for automated negotiation by: (1) identifying a minimal yet viable generic negotiation protocol and a declarative way of representing rules and constraints specific to negotiation mechanisms and strategies; (2) identifying the need of a set of basic concepts for describing negotiations that form a core negotiation ontology that the agents can use to reason about the negotiations; (3) proposing Belief-Desire-Intention (BDI) agents as an implementation model of our framework. We introduce both a conceptual framework for declarative specification of automated negotiations as well as a prototype implementation using the Jason agent programming language.