7.2 The basic models of input

For the purposes of presentation, we (somewhat arbitrarily) divide Libmarpa’s input models into two groups: basic and advanced. In the basic input models of input, every token is exactly one earleme long. This implies that, in a basic model of input,

• every token is the same length,
• the ordinal of an Earley set will always be the same as its earleme location, and
• the latest earleme and the current earleme are always equal.

In the advanced models of input, tokens may have a length other than 1. Most applications use the basic input models. The details of the advanced models of input are presented in a later chapter. See Advanced input models.