Function substitute 

pub fn substitute(
    template: &str,
    representation_id: &str,
    number: Option<u64>,
    time: Option<u64>,
    bandwidth: u64,
) -> Result<String, TemplateError>

Substitute the identifiers of an already scanned template.

Errors

TemplateError::Invalid when the template is not a valid 5.3.9.4.4 template, TemplateError::MissingNumber / TemplateError::MissingTime when the template names a value the caller did not supply. A missing value is never dropped silently: the URL would point at the wrong segment.