In the last years there has been an increasing demand of a variety of logical systems, prompted
mostly by applications of logic in AI, logic programming and other related areas. Labeled Deductive
Systems (LDS) were developed as a °exible methodology to formalize such a kind of complex logical
systems.
During the last decade defeasible argumentation has proven to be a con°uence point for many approaches
to formalizing commonsense reasoning. Di®erent formalisms have been developed, many of them sharing
common features.
This paper summarizes the most relevant features of LDSar, a logical framework for defeasible argumentation
based on LDS. We present a syntactic characterization of the framework, and discuss some emerging
properties. We also show how di®erent existing argumentation frameworks are subsumed in LDSar