In this paper we present how an open object-oriented database model can be used for modelling argumentative networks utilized by an authoring system in a hypermedia environment. The concepts of our open object-oriented data model are presented and an example of an argumentative schema represented as a hypermedia network is given. The paper shows how the concepts of the data model, especially the concept of metaclasses, can be employed in order to specify the semantics of the primitive constituents of an argumentative network and to tailor the data model for these specific needs.

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