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UML Structural Models

UML Structural Diagrams depict the elements of a system that are independent of time and that convey the concepts of a system and how they relate to each other. The elements in these diagrams resemble the nouns in a natural language and the relationships that connect them always show structural or semantic relationships. For example, a structural diagram of a vehicle reservation system might contain elements such as Car, Reservation, Drivers Licence and Credit Card, and contain connectors linking these elements. Experienced modelers will also show the relationships to behavioral elements on these diagrams.

The UML defines seven types of UML structural diagrams.

Structural Diagram types

Diagram Type


See also


Class diagrams capture the logical structure of the system, the Classes and objects that make up the model, describing what exists and what attributes and behavior it has.

Class Diagram

Composite Structure

Composite Structure diagrams reflect the internal collaboration of Classes, Interfaces and Components (and their properties) to describe a functionality.

Composite Structure Diagram


Component diagrams illustrate the pieces of software, embedded controllers and such that make up a system, and their organization and dependencies.

Component Diagram


Deployment diagrams show how and where the system is to be deployed; that is, its execution architecture.

Deployment Diagram


Object diagrams depict object instances of Classes and their relationships at a point in time.

Object Diagram


Package diagrams depict the organization of model elements into Packages and the dependencies amongst them.

Package Diagram


Profile diagrams are those created in a «profile» Package, to extend UML elements, connectors and components.

Profile Diagram