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We recommend that users create overriddes. This creates the problem that there is no syntax to unset a property. Thus, the user needs to just set the property to "something else" in the override file. But then the blurb saying that "VAR=1" (or "VAR=0" in some cases) is the only allowed value can be confusing. Say that both 0 and 1 can be set, since this documentation is also intended for end users. In our files, we generally don't want the override values anywhere. But we have a test which checks the rvalue, which should be enough.
Files in this directory specify a description of hardware devices, in the form of mappings from modalias-like keys (which identify specific hardware devices) to udev properties. Files in this directory are not read by udev directly. Instead, man:systemd-hwdb(8) compiles them into a binary database. See man:hwdb(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of the udev daemon. Use 'systemd-analyze cat-config udev/hwdb.d' to display the effective config.