Orgitem
From Documentation
Orgitem
Employment/Purpose
Orgitem contains a node (Orgnode), and an optional Orgchildren.
If the component doesn't contain a Orgchildren, it is a leaf node that doesn't accept any child items.
If it contains a Orgchildren, it is a branch node that might contain other items.
For a branch node, an +/- button will appear at the beginning of the node, such that user could open and close the item by clicking on the +/- button.