Martin ERD Symbols
Martin ERD diagrams include lots of special shapes including data entity, activity entity, data item, connection, event, square loop, and/or branch, top to bottom, side to top, one, many, one or more, zero or one, etc. Your diagrams will certainly look more professional with these shapes.
Martin ERD Symbols
Martin ERD Shapes
Data entity is an object, event, or phenomenon about which data is stored in a database.
Data item is a unit of data contained in a record, describing a particular attribute, and it requires one or several bits, bytes, or words to represent an entity.
Connection is the setting up of resources so that a particular object such as a database or file can be read or written to.
Events with different colors represent different events.
Composition relationship, which was named composition association relationship in UML 1.4, represents whole-part relationships and is a form of aggregation. A composition relationship specifies that the lifetime of the part classifier is dependent on the lifetime of the whole classifier.
Inheritance relationship helps to communicate structure and inheritance of an object model. Inheritance relationships organize classes into generalization-specialization (superclass-subclass) hierarchies; they provide a basic re-use mechanism for sharing attributes and operations.
Dependency relationship is a relationship in which one element, the client, uses or depends on another element, the supplier.
Association is a relationship between two classifiers, such as classes or use cases, that describes the reasons for the relationship and the rules that govern the relationship.
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