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Are there any naming conventions for resource names with two parts in it? Would it be snake case `car_tire` ?

Cerbos doesn't impose one other than restricting the set of characters you can use in the name (you can <https://docs.cerbos.dev/cerbos/latest/policies/authoring_tips.html#_editor_configurations|configure the editor> to warn you about that). The naming convention is up to you.  That being said, I think it's more common to use underscores to separate words.

for reference, the protobuf schema defines this validation for the resource name
```message ResourcePolicy {
  string resource = 1 [(validate.rules).string = {
    pattern: "^[[:alpha:]][[:word:]\\@\\.\\-/]*(\\:[[:alpha:]][[:word:]\\@\\.\\-/]*)*$",
    min_len: 1
  }];```