The future of DatasetUrl

[lesserwhirls]

It feels like a lot of the functionality in DatasetUrl could be moved to the individual NetcdfFileProviders, but as it stands now, the providers rely heavily on having access to the a scheme. The isOwnerOf method of the interface could be modified to accept a string, and each implementation could do inspect the string to see if a provided location belongs to it? That would take us from one call to annotate with the correct scheme to N provider calls, but maybe the overhead there is not too large?