Physical system
narrower: Processing and Treatment (for both Material and Sample)
narrower: Reference
narrower: Spatial qualifier
narrower: Material
narrower: Sample
type: Concept

Processing and Treatment (for both Material and Sample)
type: Concept
broader: Physical system

Reference
type: Concept
broader: Physical system

Spatial qualifier
type: Concept
broader: Physical system

Material
type: Concept
broader: Physical system

Sample
type: Concept
broader: Physical system