Relationships in an object knowledge representation model

SHOOD, an object-oriented model, in which every attribute is a relationship, is discussed. Vertical relationships structuring knowledge (e.g., specialization) and horizontal relationships linking pieces of knowledge (e.g., composition) are distinguished. Here, object hierarchies (vertical) and interobject links (horizontal) are treated equally. Often, only one of these aspects is fully developed. It is suggested that vertical and horizontal relationships can be the basis of an object knowledge representation system.<
>