Principle

A broad, less defined virtue. Compliance to a principle will be difficult to measure and may be subjective.

Principles maybe recommended, suggested or mandatory.

Examples (fictitious):

• we all eat rocks {a principle because we do not define what a rock is}
• all JSON should be laid out in a pretty format when saved to file {a principle because we do not state the formatting and is therefore subjective }
• all database column names should have a business meaning {a principle because it is hard to measure compliance }