Get the parent node of a child
| return | parent | child | description |
| true | valid | valid | Returns parent node |
| false | invalid | valid | Child has no parent node |
| false | invalid | invalid | Logic error |
| parent |
An iterator for the parent node. If the child does not have a parent, or a logic error occurs, the parent iterator is set to invalid. |
| child |
The child iterator to obtain the parent iterator for. |
|
True when parent represents a valid iterator |