Data Transformation Engine Type Designer Reference Guide

Chapter 1 - Introduction Hierarchy of a Type Tree

Subtypes have more specific properties. For example, two different kinds of fields,

Name and Date, may be defined as subtypes of Field.

The item type Field describes any field. The item types Date and Name are more

specific kinds of fields.

The hierarchy in the type tree window is a classification hierarchy. The deeper the

subtype is in the type tree, the more specific the data characteristics. This kind of

hierarchy, a classification hierarchy, may be new to you if you are only familiar

with compositional hierarchies because there are different kinds of hierarchies.

A common example of a classification hierarchy is the animal classification system.

Each animal is classified according to class, genus, species, and so on. All of the

primates are classified as primates. However, there are certain kinds of primates.

An ape, a chimpanzee, and a monkey are different examples of primates. In the

following animal classification tree example, Primate is a category type with

different kinds of primates as subtypes (Ape, Chimpanzee, and Monkey).

Date and

ame are

subtypes of Field