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I think Chad and I saw this kind of pattern as useful because the MDA framework was designed to be extremely extensible. It's relatively easy to gin up something, for example, that blacklists any entity with entityID containing "http://iay.org.uk" (e.g., using an XPathFilteringStage). Similarly, inserting a fixed Irish flag logo into any entity whose MDRPI says its from the Irish registrar but which doesn't already have an MDUI logo defined is a pretty simple application of XSLTransformationStage.
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