摘要：A method in an innovation and effects caused by it are described in patent document. We regard the method-caused effect as causal relationship and consider it available to construct creativity support system, therefore we have extracted some causal relationships. In the future, we try integrating hierarchical relationships into causal relationships to construct funcion of analogical reasoning. Therefore, in this work, we extracted hierarchical relationships from patent documents, especially selecting medical field as extracting target.
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