Structure Structure Structural relations are divided into two groups: The static,relatively stable aspect of the system Non-transient,long-term relationships among objects in the system 1.General structural relations .A snapshot of the system at a given time point that describes the state bi-directional of the system-the state of each of its object Disk stores File structural link: is stored in Structure is about the static aspect of the system,while behavior is (a) about its dynamics. unidirectional Disk stores File structural link: Structural Relation: (b) an association that holds between two or more things (objects and/or 2.Fundamental structural relations processes)in the system for some non-negligible time. ③cLao 国 ③cLco 国 Fundamental Structural Relation Aggregation-Particulation: A structural relation that defines the relation one of the following structural relations: between the whole and its parts. Aggregation-Particulation Symbol:▲ Featuring-Characterization △ VOPDtop.opa 回☒ Generalization-Specialization △ Image Classification-Instantiation Foreground Background Since those relations are so widespread,special OPL: symbols are assigned for their corresponding links Object Image consists of Foreground and Background. Aggregation exists between things of the same kind: An object aggregates objects and process-processes. ③ctGe ③ctse@+ - Structure • The static, relatively stable aspect of the system • Non-transient, long-term relationships among objects in the system • A snapshot of the system at a given time point that describes the state of the system - the state of each of its object • Structure is about the static aspect of the system, while behavior is about its dynamics. Structural Relation: an association that holds between two or more things (objects and/or processes) in the system for some non-negligible time. + - Structural relations are divided into two groups: 1. General structural relations bi-directional structural link: Disk stores File Disk stores is stored in File (a) (b) unidirectional structural link: 2. Fundamental structural relations Structure + - one of the following structural relations: • Aggregation-Particulation • Featuring-Characterization • Generalization-Specialization • Classification-Instantiation Since those relations are so widespread, special symbols are assigned for their corresponding links Fundamental Structural Relation + - A structural relation that defines the relation between the whole and its parts. Symbol: Aggregation-Particulation: OPL: Object Image consists of Foreground and Background. Aggregation exists between things of the same kind: An object aggregates objects and process - processes.