The rule that a State legislature can make a law operating on persons, property or objects located outside its territory, provided there is a real and sufficient connection (nexus) between the State and that subject matter.
It is a clean federalism and Article 245 concept, often tested through the extent of State legislative power and the validity of State taxes touching out-of-State activity.
Extra-territorial operation is freely available to Parliament under Article 245(2); a State law needs a genuine territorial nexus to bind out-of-State subject matter.
A State law can reach outside its borders only with a real and sufficient nexus to the State (Article 245; R.M.D. Chamarbaugwala, 1957).