I can answer the question. To make sure my answer is clear, I'm going to answer in my first language.
The definition is set out in the legislation. It requires that you have a project that is owned by a public authority. The interest paid has to be borne by the public authority. It is typically in these kinds of arrangements where the cost of the interest is built into the pricing terms, so it's indirectly borne by the public authority. The interest has to be paid to an arm's-length person so it can't be internal interest. There is a rule to allow for situations where there could be back-to-back interest payments, but, ultimately, it has to be interest paid to an arm's-length person.