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van Hage, W. R., de Rijke, M., & Marx, M. J. (2004). Information retrieval support for ontology construction and use. Lecture Notes in Computer Science, 3298, 518-533.
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Afanasiev, L., Blackburn, P., Dimitriou, I., Gaiffe, B., Goris, E., Marx, M. J., & de Rijke, M. (2004). PDL for ordered trees. Journal of Applied Non-Classical Logics, 2(15), 115-135.
Marx, M. J., & de Rijke, M. (2004). Semantic characterizations of navigational XPath. In V. Mihajlovic, & D. Hiemstra (Eds.), Proceedings of the First Twente Data Management Workshop (pp. 67-73)
Marx, M. J. (2004). Conditional XPath, the first order complete XPath dialect. In Proceedings of PODS'04 (pp. 13-22). ACM Press.
Marx, M. J. (2004). XPath with conditional axis relations. Lecture Notes in Computer Science, 2992, 477-494.
