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Providing Consistent and Exhaustive Relevance Assessments for XML Retrieval Evaluation AbstractComparing retrieval approaches requires test collections, which consist of documents, queries and relevance assessments. Obtaining consistent and exhaustive relevance assessments is crucial for the appropriate comparison of retrieval approaches. Whereas the evaluation methodology for flat text retrieval approaches is well established, the evaluation of XML retrieval approaches is a research issue. This is because XML documents are composed of nested components that cannot be considered independent in terms of relevance. This paper describes the methodology means that an XML retrieval system needs not only to find relevant information in the XML documents, but also to determine the appropriate level of granularity to return to the user. A consequence of this retrieval paradigm is that the relevance of an element is depends both on content and structural conditions. Evaluating the effectiveness of XML retrieval systems, hence, requires a test collection where the relevance assessments are provided according to a relevance criterion that takes into account the
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