 This approach is often combined with a certain account of semantic content. One of the main purposes of language is to transmit information about the world. Where \(P\) is any sentence used for that purpose (roughly speaking, a declarative sentence), it seems natural to think of \(P\)’s content (the proposition expressed by it) as the information that is semantically encoded in it. Combining this with the foregoing account of information, we can think of the content of a sentence as a set of possible worlds (namely, the set containing just those worlds of which the sentence is true) or, equivalently, as a function from worlds to truth-values.