How to get all cups avaible variables to set on cups4j?

On cups4j I can set variables such as:

attributes.put("job-attributes", "print-quality:enum:4#fit-to-page:boolean:true#sheet- collate:keyword:collated");

How do I find out all variables that can be set?

Thanks.

Solution

Thiago, I'm trying to get to grips with cups4j too.

Unfortunately, cups4j is one of the most poorly documented Open Source projects I've ever seen.

I found some of the attributes in RFC 2911.
(Internet Printing Protocol/1.1: Model and Semantics)

Addendum: just noticed RFC 8011 which supersedes RFC 2911:

If I find out more, I'll post it here.

Found something @ IANA...