A tree structure is conceptual, and appears in several forms.

Some agencies have only one level in the tree structure while others can have up to three levels.

Hierarchical model: The data is organized like a tree structure.

The data can then be represented in a tree structure known as a dendrogram.

This tree structure exists for each product within a company's range.

Here, ideas are written in a tree structure, with lines connecting them together.

In these systems the tree structure can look more like a directed graph with possible cycles.

The only difference is that you need an additional tree structure per vertical interval.

The tree structure which resulted was four to six times larger than what had been produced on the ground.

The agents are organized in a tree structure called Instance.