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This book constitutes the proceedings of the Kiel Declarative Programming Days, KDPD 2013, unifying the following conferences: the 20th International Conference on Applications of Declarative Programming and Knowledge Management (INAP 2013), the 22nd International Workshop on Functional and (Constraint) Logic Programming (WFLP 2013) and the 27th Workshop on Logic Programming (WLP 2013), held in Kiel, Germany, in September 2013. The 15 papers presented were carefully and reviewed and selected for inclusion in this book. They cover the following topics: logic programming, constraint problem solving, programmable logic solvers, functional programming and constraint programming.

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Construction of Explanation Graphs from Extended Dependency Graphs for Answer Set Programs.- Sharing and Exchanging Data.- Propositional Encoding of Constraints over Tree-Shaped Data.- On a High-Level Approach to Implementing Exact Real Arithmetic in the Functional Logic Programming Language Curry.- On Axiomatic Rejection for the Description Logic ALC.- And Action! - Monoid Actions and (Pre)orders.- HEX-Programs with Existential Quantification.- Introducing Real Variables and Integer Objective Functions to Answer Set Programming.- Coverage Driven Test Generation and Consistency Algorithm.- A Datalog Engine for GPUs.- Towards Parallel Constraint-Based Local Search with the X10 Language.- Debate Games in Logic Programming.- A Descriptive Handling of Directly Con icting Rules in Preferred Answer Sets.- Some Experiments on Light-Weight Object-Functional-Logic Programming in Java with Paisley.- Heuristic Search Over Program Transformations.

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