Add AlternativeNumber element #67
Description
Is your feature request related to a problem?
No, it would be a potential enhancement.
Describe the solution you'd like
Add an AlternativeNumber element to track legacy number and numbering snafu's with Golden Age comics. This would be a non-breaking change for a future revision to the spec.
Additional context
It would probably be best for the element to be a xs:string type since it's likely some publisher would use a non-integer value.