Employee ORM diagram

This object-role modeling (ORM) diagram sample shows model of employee data: birthdate, hiredate, rank, company car number. It was designed on the base of the Wikimedia Commons file: ORM-diagram-tkz-orm.png. [commons.wikimedia.org/wiki/File:ORM-diagram-tkz-orm.png] "Facts. Object-role models are based on elementary facts, and expressed in diagrams that can be verbalised into natural language. ... This "fact-based" approach facilitates modeling, transforming, and querying information from any domain. ... Attribute-free. ORM is attribute-free: unlike models in the entity–relationship (ER) and Unified Modeling Language (UML) methods, ORM treats all elementary facts as relationships and so treats decisions for grouping facts into structures (e.g. attribute-based entity types, classes, relation schemes, XML schemas) as implementation concerns irrelevant to semantics. By avoiding attributes in the base model, ORM improves semantic stability and enables verbalization into natural language. ... Fact-based modeling. Fact-based modeling includes procedures for mapping facts to attribute-based structures, such as those of ER or UML. ... Fact-based graphical notations are more expressive than those of ER and UML. ... Design procedure. System development typically involves several stages such as: feasibility study; requirements analysis; conceptual design of data and operations; logical design; external design; prototyping; internal design and implementation; testing and validation; and maintenance." [Object-role modeling. Wikipedia] The object-role modeling diagram example "Employee ORM diagram" was designed using ConceptDraw PRO software extended with ORM Diagrams solution from Software Development area of ConceptDraw PRO Solution Park.