ipptoolfile man page: Document method to reference collection members and logical operators for predicates

[wifiprintguy]

The man page for ipptoolfile doesn't seem to clearly include a description of how a test can reference a particular member within a collection, nor does it document what logical operators can be used for the values.

For members of a collection, a "path" is used, like so:

EXPECT finishings-col/baling OF-TYPE collection

It also isn't clear what logical operators the author of a .test file could use in a predicate. For instance, they might want to include an EXPECT directive like so:

EXPECT uri-authentication-supported OF-TYPE keyword IN-GROUP printer-attributes-tag WITH-VALUE 'basic' | 'certificate' | 'digest' | 'negotiate' | 'OAuth 2.0'

(If the latter isn't possible then I'll file a separate enhancement request...)

[michaelrsweet]

This should be filed against the libcups project since we import ipptool from it. Thanks!

[wifiprintguy]

I'll move it over there - thanks!