Thanks for the update. I am 99% through importing the current pbf. I appreciate the information abou the different file types and, especially, that the changeset files weren't actually adding any information to the local dataset. I hadn't read through the definitions carefully, just assumed that the changeset would load anything that had changed since the last release. It still takes over a day to load, but it's only needed when I want to bring the maps up to current status.
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YAAC is a great tool. Thanks very much for your work on it!