## ISO Standards Tag Set (ISOSTS) version 0.6: A customization of NISO JATS version 0.4

#### International Organization for Standardization (ISO)

# Document Hierarchy Diagrams

### Key to the Near & Far Diagrams

#### Element Occurrences

| Required
| Optional. May occur zero or one times.
| Required, repeatable. May 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

#### Grouping Elements

| Required sequence: Element1 followed by Element2 followed by Element3
| Choice of sequence: Element1 or Element2 or Element3

#### Compound Examples

| 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

### Subsidiary sections:

#### Top level element: Standard or Standards-Related Document

#### Front Matter structures

#### Body and Section structures

#### Back Matter structures

#### Common structures

## ISO Standards Tag Set (ISOSTS) version 0.6: A customization of NISO JATS version 0.4

#### Version of December 2011