Constituting the proceedings of the 6th International Symposium on Functional and Logic Programming, held in Aizu, Japan, this volume contains 15 revised full papers and three full invited papers, covering program transformation and analysis, semantics, rewriting and compilation techniques.

Invited Papers.- Formal Methods in CafeOBJ.- The Essence of XML (Preliminary Version).- To the Gates of HAL: A HAL Tutorial.- Tutorial Paper.- Functional Logic Design Patterns.- Constraints.- On Consistency and Width Notions for Constraint Programs with Algebraic Constraints.- Solving Mixed Quantified Constraints over a Domain Based on eal Numbers and erbrand Terms.- Program Transformation and Analysis.- On the Correctness of the Factoring Transformation.- Lambda-Lifting in Quadratic Time.- Semantics.- The Well-Founded Semantics in Normal Logic Programs with Uncertainty.- Linearly Used Effects: Monadic and CPS Transformations into the Linear Lambda Calculus.- Coinductive Interpreters for Process Calculi.- Rewriting.- Descendants and Head Normalization of Higher-Order Rewrite Systems.- Narrowing Failure in Functional Logic Programming.- Compilation Techniques.- The HiPE/x86 Erlang Compiler: System Description and Performance Evaluation.- Dynamic-Cut with Definitional Trees.- Programming Methodology.- The Head Condition and Polymorphic Recursion.- Structural Abstraction and Application in Logic Programming.- VM?: A Functional Calculus for Scientific Discovery.