Cardinality notation allows you to choose from among five popular styles for displaying associative properties, such as one-to-one or one-to many.

Note that you can be working with any type of diagram and still have access to all styles. For example, many users select Booch style for their entity relation diagrams, due to its similarity to the original Chen notation.

If you specify a style that must appear at the end points of relation lines, such as crow’s feet, then the ability to also display flow/sequence arrowheads at end points will automatically be disabled.