silverstripe-framework/tests/security/PermissionTest.yml

PermissionRole:
   author:
      Title: Author
   access:
      Title: Access Administrator

PermissionRoleCode:
   author1:
      Role: =>PermissionRole.author
      Code: CMS_ACCESS_MyAdmin
   author2:
      Role: =>PermissionRole.author
      Code: CMS_ACCESS_AssetAdmin
   access1:
      Role: =>PermissionRole.access
      Code: CMS_ACCESS_SecurityAdmin
   access2:
      Role: =>PermissionRole.access
      Code: EDIT_PERMISSIONS

Member:
   author:
      FirstName: Test
      Surname: Author
   access:
      FirstName: Test
      Surname: Access Administrator
   globalauthor:
      FirstName: Test
      Surname: Global Author

Group:
   author:
      Title: Authors
      Members: =>Member.author
      Roles: =>PermissionRole.author
   access:
      Title: Access Administrators + Authors
      Members: =>Member.access
      Roles: =>PermissionRole.access,=>PermissionRole.author
   globalauthor:
      Parent: =>Group.author
      Title: Global Authors
      Members: =>Member.globalauthor

Permission:
   extra1:
      Code: SITETREE_VIEW_ALL
      Group: =>Group.author
   globalauthor:
      Code: SITETREE_EDIT_ALL
      Group: =>Group.globalauthor