Practitioner is a type of Professional. Practitioner is related to Doctor. you are likely to find Needle in/at/on Doctor. you are likely to find Needle in/at/on Hospital. 
Dimension is a type of Concept. Concept is related to Rule. Rule is related to Must. 
Professional <--IsA-- Practitioner <--RelatedTo--> Doctor <--AtLocation-- Needle --AtLocation--> Hospital 
Dimension --IsA--> Concept <--RelatedTo--> Rule <--RelatedTo--> Must 