Support for collections

[pjorg]

Some of the more complex IPP tasks require the use of collections to pass structured information to the printer. As far as I can tell, there is no current support for members beyond one layer deep in a group.

Can support for collections be added?

[Rudd-O]

I'm also in dire need for IPP collections support. Without it, I can't specify e.g. margins on the page to be printed. Even the raw() method of the class IPP won't let me pass raw-constructed data.

[Rudd-O]

I've simply done the work.

#723 solves your issue.

As a bonus, it also lets python-ipp users specify custom attributes not contemplated by the library author.