Document Hierarchy Diagrams
Key to the Near & Far Diagrams
|Optional. May occur zero or one times.
|Required, repeatable. Must occur one or more times.
|Optional, repeatable. May occur zero or more times.
Additional Symbols Associated with Elements
|Element content is expanded elsewhere in the diagram.
|The element has attributes.
|One or more elements collapsed for clarity
|Element is the root element of the model.
|Text, numbers, and special characters
|Required sequence: Element1 followed by Element2 followed by Element3
|Choice of sequence: Element1 or Element2 or Element3
|Zero or more repetitions of Element1 or Element2 or Element3 followed by zero or one occurrences of Element4
|Zero or one occurrences of either Element1 followed by Element2 followed by Element3 or one or more occurrences of Element4
|Either one or more repetitions of Element1 followed by Element2 or one or more occurrences of Element4