This package implements `elements` and `boundaries` coming from the [C4 Model](https://c4model.com).

### Legend

The C4 Model legend can be displayed using the procedure:
```
C4Legend()
```

### Relationship for C4 diagrams

The relationships' texts between the diagram's items can be formatted using the procedure:
```
C4Relationship("an expected reason of the relationship", "an optional technology")
```
