The OCaml Journal just published an article describing term rewriting:

*"An interesting and powerful alternative to the conventional term-level interpreter is called term rewriting. Rather than reducing expressions down to values, term rewriting simply evaluates expressions by performing substitutions and the result is another expression. This approach is particularly well suited to computer algebra systems such as Mathematica but is also an underappreciated alternative to dynamically-typed programming languages that can integrate useful features like pattern matching and make techniques like partial specialization far easier. This article describes how a simple term rewriter can be constructed and introduces the concept of private variant type constructors in the process..."*

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