Reading draft-ietf-ipp-model-v11-0201.txt, section 3.2.2, "Print-URI
Operation", it looks like it's an implementation decision whether to pull
the data from the document-uri at job submission time or at job processing
time. Say I decide to pull the data at job submission time. Say I get
some kind of error doing so, like no-route-to-host, or HTTP 404. Shouldn't
I return some kind of error status? Currently, it looks like I have to
return successful-ok as long as the document-uri uses a scheme I support,
regardless of whether or not I can actually get the document data.