Double line?

Question

How to connect entities with a double line?

Answer 1

You need to create two single-line connections to simulate a double line. You might have to adjust the source and target ports of those connections to prevent them from lying right on top of each other. To adjust the ports, select the connection, go to the properties table in yEd's lower right corner, and adjust the "Source Port X", "Source Port Y", "Target Port X", and "Target Port Y" values.

Answer 2

You may use two lines:

1. Create a thick black line.
2. Create a not as thick white line. The white line will split the black line in two.