United States v. Aguila-Montes de Oca, 523 F.3d 1071 (9th Cir. Apr. 28, 2008) (where California Penal Code 459 does not require proof beyond a reasonable doubt that the burglary arose from an "unlawful" entry into a building, the "unlawful" language in the charging document is not an element of the offense, but rather a fact that the defendant has admitted to in taking the plea; because this fact was specifically admitted by the defendant at plea, it may be used as part of the record of conviction under the modified categorical analysis to determine that the defendant admitted committing a "generic" burglary offense by making an "unlawful" entry).