Getting list of all zones and regions

[
 {
  "id": "1",
  "name": "Zone 1",
  "regions": [
   {
    "id": "1.1",
    "zoneId": "1",
    "name":"Region 1.1",
    "zoneDescription": "Zone description"
   }
  ]
 },
 {
  "id": "2",
  "name": "Zone 2",
  "regions": [
   {
    "id": "2.1",
    "zoneId": "2",
    "name": "Region 2.1",
    "zoneDescription": "Zone description"
   }
  ]
 }
]

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<zones>
 <zone>
  <id>1</id>
  <name>Zone 1</name>
  <regions>
   <id>1.1</id>
   <name>Region 1.1</name>
   <zoneDescription>Zone description</zoneDescription>
   <zoneId>1</zoneId>
  </regions>
 </zone>
 <zone>
  <id>2</id>
  <name>Zone 2</name>
  <regions>
   <id>2.1</id>
   <name>Region 2.1</name>
   <zoneDescription>Zone description</zoneDescription>
   <zoneId>2</zoneId>
  </regions>
 </zone>
</zones>