This section addresses the complexities of generating XPath queries for testing XML processors, focusing on two main challenges: referencing non-existent elements and achieving non-empty results. Non-existent elements can lead to queries evaluating to empty sequences, failing to exercise the logic of the processors. Similarly, predicates that evaluate to false can inadvertently create empty result sets, hindering effective testing. Hence, the approach emphasizes the need to generate queries that stimulate the processor's logic and avoid returning empty outcomes.
Generating XPath expressions presents challenges, particularly avoiding references to non-existent elements and ensuring that predicates do not yield empty result sets.
Our methodology emphasizes the importance of crafting valid queries that exercise the underlying logic of XML processors effectively, reducing instances of empty sequences.
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