ENGLISH

Graph Data Model: and Its Data Language

By Hideko S. Kunii (auth.)

Book information

Publisher
Springer Tokyo
Year
1990
ISBN
978-4-431-68116-8, 978-4-431-68114-4
DOI
10.1007/978-4-431-68114-4
Language
english
Format
PDF
Filesize
3 MB (3059935 bytes)
Edition
1
Pages
106\116
Orientation
yes
Scanned
yes
Time added
2013-08-01 04:00:00
Data Structures; Models and Principles

Description

Complex databases can be understood well with visual representation. A graph is a very intuitive and rational structure to visually represent such databases. Graph Data Model (GDM) proposed by the author formalizes data representation and operations on the data in terms of the graph concept. The GDM is an extension of the relational model toward structural representation. In this model, a database is defined by a schema graph where nodes represent record types and arcs represent link types that are relationships between two record types. The capabilities of the GDM include direct representation of many-to-many relationships and of the relationships within a single record type. The characteristic operators are those associated with links: existential, universal, numerical and transitive link operators. Graph Data Language (GDL) is a data language based on this GDM. The essence of the GDL is path expressions used for formulation of queries. The concepts of GDM and GDL have actually been implemented by Ricoh Co., Ltd. and a system based on these concepts is commercially available for many UNIX machines.

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