This diagram type supports two basic types of elements: Places and Transitions.
Place - is depicted as a circle. There are two types of places:
- Continuous - depicted as a double circle
- Discrete - depicted as a single circle
Places may contain one or more tokens (markings), depicted as dots.
Transition - is depicted as a filled rectangle. There are two types of Transitions:
- Continuous - depicted as an empty rectangle
- Discrete - depicted as a filled rectangle
The places and transitions are connected using arrowed connectors called Arcs. Arc can connect only a place and a transition (never two places or two transitions).
There are multiple types of Arcs:
- Normal - depicted as a normal line with an arrow
- Inhibitory - depicted as a dashed line with a circle after the arrow
- Test - depicted as a dashed line with an arrow