XProc  - XProc

An XML Pipeline specifies a sequence of operations to be performed on one or more XML documents. Pipelines generally accept one or more XML documents as input and produce one or more XML documents as output. Pipelines are made up of simple steps which perform atomic operations on XML documents and constructs similar to conditionals, loops and exception handlers which control which steps are executed.

Extrait de [ recommandation XProc: An XML Pipeline Language]