com.r3corda.contracts / ReferenceRate / <init>

<init>

ReferenceRate(oracle: String, tenor: Tenor, name: String)

So a reference rate is a rate that takes its value from a source at a given date e.g. LIBOR 6M as of 17 March 2016. Hence it requires a source (name) and a value date in the getAsOf(..) method.