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XLR: Extensible Language and Runtime The art of turning ideas into code Conceptual Overview Up Here is a conceptual overview of XL and Concept Programming. Each key concept is illustrated by examples, and points back to the implementation in the compiler. General Overview XL Concept Programming What is a concept? The Concept Programming Process Concept Programming Metrics: syntactic noise, semantic noise, bandwidth and signal/noise ratio Concept Representations and Concept casts An unlimited set of concepts Problem statement Problem Space Code Space Moore's Law and Software The Sources of Software Complexity Existing Practice Limits of existing languages Evaluating existing languages The Difference between Objects and Concepts Syntax and syntactic noise Semantics and semantic noise XL Usage Models XL as a data language XL as a domain-specific language XL as a high-performance programming language XL as a scripting language Noteworthy XL Features XL0, XL1, XL2 Expression reduction XL operators Compile-time variadics Generic declarations, True Generic Types and Generics validation Language extensions Pragmas Up Copyright 2008 Christophe de Dinechin (Blog) E-mail: XL Mailing List (polluted by spam, unfortunately)