vCloud director 9.7 API - create new logical VM group

Hi,

I started to explorer API and did some basic stuff. Now I want to create new VM logical group, but I'm out of understanding.

According VMware documentation syntax should be like this:

/cloudapi/1.0.0/logicalVmGroups

{
  "id":"string",
  "description":"string",
  "name":"string",
  "namedVmGroupReferences":[
   {
   "name":"string",
   "id":"string"
   }
  ]
}

I'm not familiar with VMware API and confused what I should put in ID? Searched API documentation, but can't find answer.

Thanks!