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The exact validation of streaming XML documents can be realised by using Visibly Push-down Automata (VPA) that are defined by Extended Document Type Definitions (EDTD). It is straightforward to represent such an automaton as an Abstract State Machine (ASM). However, creating a whole VPA is not an efficient validation approach. In this paper it is shown, how the VPA construction can be avoided by using a refined ASM that only requires knowledge of the EDTD. In a second step this approach is extended to approximate validation of streaming XML documents taking at most k updates to the document into consideration.
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