Explain to me this casbin rule {
 p\_type: 'p',
 v0: 'admin',
 v1: '/:company/:project/:team',
 v2: '/companies/public-domains',
 v3: 'POST',
 },
The rule you provided is in the context of Casbin, an authorization library that supports access control models like ACL, RBAC, ABAC, etc. The rule specifies a permission that defines what actions a user or role can perform on certain resources. Let's break down the components of this rule:

- **p_type: 'p'**: This indicates that this is a policy rule. In Casbin, policies can be defined for permissions (denoted by 'p') or for roles (denoted by 'g' for grouping).

- **v0: 'admin'**: This represents the subject or role that the rule applies to. In this case, it specifies that the permission is granted to the 'admin' role.

- **v1: '/:company/:project/:team'**: This is the resource path that the rule applies to. The colons (:) indicate variables in the path, meaning that this rule applies to any resource that matches the structure of the path. For example, it would match URLs like `/companyA/projectX/team1`, `/companyB/projectY/team2`, etc.

- **v2: '/companies/public-domains'**: This is another resource path, which could represent a specific endpoint that the 'admin' role has permission to access. This path is more specific and does not have variables.

- **v3: 'POST'**: This specifies the HTTP method that is allowed for the resource paths defined in v1
  The Casbin rule you provided is a policy rule that defines permissions for different types of operations on a resource. Here's a breakdown of each part of the rule:

1. `p_type`: This is the type of resource being protected. In this case, it's `p`, which is a generic type that can represent any type of resource.
2. `v0`: This is the identity of the user or entity that is allowed to perform the operation. In this case, it's `admin`, which means that only the `admin` user is allowed to perform the operation.
3. `v1`: This is the path of the resource that the operation is performed on. The path is separated by slashes (`/`) and can include parameters such as `company`, `project`, and `team`. In this case, the path is `/:company/:project/:team`, which means that the operation can be performed on any resource that has a `company`, `project`, or `team` parameter.
4. `v2`: This is the path of a special resource called a "public domain". In this case, the public domain is `/companies/public-domains`. This means that the `admin` user is allowed to perform operations on any resource that has a `company` parameter and is also a public domain.
5. `v3`: This is the HTTP method that is allowed to