Sure, here is an example of how you might define a

Project

namespace with

owner

,

editor

, and

viewer

relations, and

view

,

edit

,

delete

, and

chown

permissions using the Ory Permission Language (OPL). This example is based on the information provided in the knowledge sources, but please note that it's a simplified version and you might need to adjust it according to your specific needs.

typescript import { Namespace, Context } from "@ory/keto-namespace-types"  class User implements Namespace {}  class Project implements Namespace {   related: {     owners: User[]     editors: User[]     viewers: User[]   }    permits = {     view: (ctx: Context): boolean =>       this.related.viewers.includes(ctx.subject) ||       this.related.editors.includes(ctx.subject) ||       this.related.owners.includes(ctx.subject),      edit: (ctx: Context): boolean =>       this.related.editors.includes(ctx.subject) ||       this.related.owners.includes(ctx.subject),      delete: (ctx: Context): boolean =>       this.related.owners.includes(ctx.subject),      chown: (ctx: Context): boolean =>       this.related.owners.includes(ctx.subject),   } }

In this example, a

User

can

view

a

Project

if they are a

viewer

,

editor

, or

owner

of the

Project

. They can

edit

a

Project

if they are an

editor

or

owner

of the

Project

. They can

delete

or

chown

(change ownership of) a

Project

only if they are an

owner

of the

Project

. Please note that this is a simplified example and the actual implementation might require more complex logic depending on your specific needs. For more information on how to define permissions in the OPL, you can refer to the [Ory documentation](https://www.ory.sh/docs/keto/modeling/create-permission-model#define-permissions-in-the-opl).