Abstract syntax written using prefix constructor terms can become rather unreadable when patterns become large. Therefore it is attractrive to write transformation rules using the concrete syntax of the object language instead of its abstract syntax. For example, to write

  PlusZero :
     |[ e + 0 ]| -> |[ e ]|

instead of

  PlusZero :
     Plus(e, Int(0)) -> e

Starting with StrategoRelease08 concrete syntax is supported by Stratego. For a full account of this new feature and its implementation see the paper Meta Programming with Concrete Object Syntax.

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CategoryConcreteObjectSyntax