Assertion: node's list | /r/HasProperty | empty
Facets:
Source sentences:
text: To allow finite trees, one must either allow the list of children to be empty (in which case trees can be required to be non-empty, an "empty tree"
text: To allow finite trees, one must either allow the list of children to be empty (in which case trees can be required to be non-empty, an "empty tree"