Can ordered list produce result that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, …) with css?

Can an ordered list produce results that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, …) with CSS? So far, using list-style-type:decimal has produced only 1, 2, 3, not 1.1, 1.2., 1.3.