At this stage, the person nodes have a label showing
the person’s name and birthdate. You will now add a death fact
for the persons that are dead. This fact will not appear for living
persons. Therefore you need to create a style rule to insert the death
date only for dead persons.
To add a death fact to person nodes:
Select the node.person rule.
Click Edit > Create Style Rule.
Click Next.
In the Conditions page, the condition user-defined
type is person is already present as it has been defined
for the node.person rule.
Click the plus button to add a new condition.
Select the attribute deathdate and
select exists and not null.
Click Finish.
The new rule is in the Style Rules and is selected.
Right-click the rule name and rename it to something
shorter: node.person[deathdate].