pub fn from_apx(
input: &str,
) -> Result<(ValueBasedFramework<String>, Audience), Error>Expand description
Parse an APX document into (framework, audience) pair.
The resulting framework owns string-typed argument labels (matching
the arg(name) identifier in the input). The audience is derived
from the valpref facts; if no valpref facts are present, the
audience is empty.