OVF Property Qualifiers
This is additional documentation on the OVF format, specifically, extensions to Property elements that VMware has implemented. These qualifier attributes modify the way OVF properties are handled by vCenter.
Note that, as far as I know, this is not documented anywhere else. Studio uses (some of) these qualifiers, and I wrote this a while back to keep myself straight about them. Hopefully, it will be useful to other folks as well.