At the first step, the effects of SF content on the basic properties, including workability, density and compressive strength were investigated.
In principle, the exemptions and loopholes "run counter [to] the aims and content of the basic regulation as expressed by the Euro 6 limit values," says the informal paper prepared for MEPs on the parliament's environment committee.
As Kelsen himself repeatedly argued, a successful revolution brings about a radical change in the content of the basic norm.
The content of the basic norm of any given legal system is determined by the actual practices that prevail in the relevant community.
Legal validity is essentially relative to the social facts that constitute the content of the basic norm in each and every legal order.
Consider this question: What is the content of the basic norm that one needs to presuppose in order to render positive law intelligible as a normative legal order?
And we can see why: because legal validity is determined by the content of the basic norm that is actually followed in a given society.
The normative relativism which is inherent in Kelsen's conception forces him to ground the content of the basic norm in the social facts that constitute its content, namely, the facts about actions, beliefs, and attitudes actually entertained by the population in question.
