Core elements in Sequence Diagram

In this section, you will learn how to render or create sequence diagrams using Mermaid. You will also learn about the fundamental elements of a sequence diagram, what they represent, and how to define them in Mermaid. Let's begin by looking at a demonstration of a sequence diagram to see what one looks like, and then discuss the elements involved.

The sample sequence diagram describes a scenario involving a woman, a man, and a dog. For some reason, the dog is lost, and the woman tells the man to start looking for the dog. The man calls out to the dog, which barks in return. The man then tells the woman he found the dog.

In the following diagram, we can see this scenario illustrated as a sequence diagram:

Figure 7.1 – An example of a sequence diagram

In the preceding scenario, we have three actors—also called participants—which are the woman, the man, and the dog. The participants are entities...