In version 6, lists evolved to offer new capabilities. They retained the simple feature set with the ability hold a series of strings. But the feature where a list could be linked, or associated, with another list was expanded to store and display strings in an object where stings can have relations with other strings. These relations take the form where a string can be a parent, child, or sibling to another string. In the hierarchical list below, the string "Waffles" has a child relation to "Breakfast" and is a sibling to "Pancakes". A list with these relations is called a hierarchical list. A hierarchical list can be displayed in a hierarchical list form object or a hierarchical list Pop-up Menu form object.