Function parse_enum 

pub fn parse_enum<'a>(
    s: &str,
    whitelist: &[&'a str],
) -> Result<&'a str, XmlError>

Enum whitelist check per Spec §7.1.4 Tab.7.1 (enum values are string literals from DCPS-IDL, not numeric).

Errors

XmlError::BadEnum if the value is not contained in the whitelist.