What is the test for "plain meaning" in the context of the California Civil Code?

" ' "[T]he trial court's construction of a statute is purely a question of law and is subject to de novo review on appeal." ' " (People v. Failla (2006) 140 Cal.App.4th 1514, 1520.) "Our first task is to examine the language of the statute enacted as an initiative, giving the words their usual, ordinary meaning. [Citations.] If the language is clear and unambiguous, we follow the plain meaning of the measure. [Citations.] '[T]he "plain meaning" rule does not prohibit a court from determining whether the literal meaning of a measure comports with its purpose or whether such a construction of one provision is consistent with other provisions of the statute.' " (People v. Canty (2004) 32 Cal.4th 1266, 1276.)