A specified sphere of activity or knowledge. For example:

• Infrastructure Asset Management
• Rates
• Inventory

The Concept to which a statement or proposition is directed. For example, given the statement "Square is a Polygon", "Polygon" is the Object.

A predicate is the verb that links concepts to form a proposition. Predicates must contain one or more words composed entirely of lowercase letters. For example:

• describes
• focuses on
• is performed in accordance with

The Concept about which a statement or proposition is made. For example, given the statement "Square is a Polygon", "Square" is the Subject.

A (hierarchical) network comprised of concept-terms (nodes) and directed lines linking pairs of nodes; the linking lines are labeled with explanations of the relationship between node pairs.