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Scheme trees represent the hierarchical relationships between object sets. The hierarchical relationships can be modeled directly and n-ary relationships (where are modeled using more than one scheme tree. Information about the degree of the relationship is lost. Participation constraints cannot be represented in the scheme tree. However, the representation of participation constraints on the binary relationships is very comprehensive in the CM hypergraph but the meaning of the participation constraints is ambiguous when representing n-ary (n>2) relationships.
Ordering on parts of a book, like preface, table of contents, chapters, appendix. The first kind of ordering is represented by a “<” in the relationship type label, the second is represented by a “<” on the edge to the attribute, while the third is represented by a “<” beside the object class. These symbols are optional and the default is no ordering. 10. The symbol “<” on the edge between object class book and attribute author indicates that the values of the attribute author are ordered. e. the structure of book is isbn, title, authors, preface, toc, followed by the object class chapter.
7. Referencing an object class in an ORA-SS Schema Diagram Reference A reference usually represents a binary relationship type between two object classes and is used to reduce redundancy. A similar concept is used in the object oriented data model. A reference is denoted by a dashed arrow between a referencing object class and a referenced object class. The referencing and referenced object classes can have different labels and different attributes and relationship types. 7. The object class stuRe f1 is a child of object class course, and references object class student which has detailed information about each student.