Assertion: tree's node | /r/HasProperty | leaf
Facets:
Source sentences:
text: is if node is a leaf then return
text: Nodes with no children are called leaves, or external nodes.
text: Each node is either a leaf or an internal node.
text: No matter what the look and feel, the default icon displayed by a node is determined by whether the node is a leaf and, if not, whether it is expanded.
text: TreeModel specifies methods for getting a particular node of the tree, getting the number of children of a particular node, determining whether a node is a leaf, notifying the model of a change in the tree, and adding and removing tree model listeners.