The clearest example of a demonstrative is prenominal dispela, often reduced to displa or most commonly, disla. Postnominal ia is generally considered to be a focus or emphatic marker, but Smith (2002: 155–156) observes that in his data, it most often has an anaphoric function. It can also be used to direct the hearer's attention to a referent in the environment.
Source: nd: WNB M12
Source: Smith 2002: 154