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Suppose that package W uses package V, and a component P' in W overrides a component P in V. Now suppose that P' invokes P by use of the xsl:original mechanism. Suppose also that P contains a reference to component A. How is the reference to A bound? In particular, suppose that A is public or abstract in V, and is overridden by a component A' in W. Do we call A, or A'? (Either would be possible if A is public; only the latter is possible if A is abstract.) I think there will probably be fewer surprises if we treat xsl:original as invoking "the component you would have invoked in the absence of the override". This means that xsl:original invokes a component P" in which the reference to A is (re-)bound to A'.
Reading the text regarding xsl:original again, I think it is clear that the binding is to the "hidden component" in the using package, not the original component in the used package; indeed this is the only solution that makes sense.