如果我使用数组,如何在ACL文件的规则中写入条件?

我有一条规则:

rule Viewer {
  description: "Allow the viewer read access to his assigned assets"
  participant(v): "org.biz.app.Viewer"
  operation: READ
  resource(d): "org.biz.app.Activo"
  condition: (v.getIdentifier() === d.viewers.getIdentifier())
  action: ALLOW
}

在模型文件中:

asset Activo identified by acitvoId {
  o String activoId
  o String activoName
  o Integer version
  o DateTime startDate
  o DateTime endDate
  --> Author owner
  --> Viewer[] viewers optional
}

我想要的规则是,查看器只对分配给他的资产具有读取权限。 这个:

v.getIdentifier();

--> Viewer[] viewers optional

如果viewerid在数组中,则查看器具有读取权限。我该怎么写那个规则?