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A knowledge base consisting of topic maps of various fields, such as physics, chemistry, earth science, industry, daily life, history etc., was constructed for an online learning system. Topics in different fields were interlinked by using specific inter-field associations. Also, topics that were cited in more than one field were put in the field where they are most central and were also linked in the contexts of each of the other field. This indicates the multidimensionality of topics linked with multiple topic maps. In addition to the main knowledge base, two types of topic map with smaller granularity were created for test cases. The first was for the expression of variant definitions of basic quantities for various grade levels, and the second was for generating instruction scenarios. These micro-topic maps were linked to the main knowledge base map by attaching the same subject identifiers to corresponding topics in both maps.