Basic Structure

Backus-Naur Form (BNF)
Namespaces
Types & Multiplicity
Constraints
Dependencies
Time
Intervals
Packages
Information Flows
Classification

Classifiers
Properties
Operations
Generalization Sets
Instances
Structured Classifiers

Structured Classifiers
Classes
Associations
Collaborations
Components

Encapsulated Classifiers
Components
Deployments
Artifacts
Nodes
Common Behavior

Signals
Receptions
Behaviors
Events
Activities and Actions

Activities
Control Nodes
Object Nodes
Activity Groups
Actions
Invocation Actions
Structured Actions
Expansion Regions
Interactions

Interactions
Lifelines
Messages
Fragments
Interaction Uses
Sequence Diagrams
Communication Diagrams
State Machines and Use Cases

Statemachine topics
Protocol Statemachines
Interfaces
Use Cases