libvirt domain json

{
  "_content": {
    "devices": {
      "_content": [
        {
          "emulator": {
            "_content": "\/usr\/bin\/kvm"
          }
        },
        {
          "disk": {
            "_content": {
              "source": {
                "_attributes": {
                  "file": "\/srv\/kvm\/dev-ots02\/disk0.qcow2"
                }
              },
              "target": {
                "_attributes": {
                  "bus": "ide",
                  "dev": "hda"
                }
              }
            },
            "_attributes": {
              "device": "disk",
              "type": "file"
            }
          }
        },
        {
          "interface": {
            "_content": {
              "mac": {
                "_attributes": {
                  "address": "52:54:00:15:e9:80"
                }
              },
              "model": {
                "_attributes": {
                  "type": "virtio"
                }
              },
              "source": {
                "_attributes": {
                  "bridge": "br0.2"
                }
              },
              "target": {
                "_attributes": {
                  "dev": "vnet5"
                }
              }
            },
            "_attributes": {
              "type": "bridge"
            }
          }
        },
        {
          "interface": {
            "_content": {
              "mac": {
                "_attributes": {
                  "address": "52:54:00:d0:56:73"
                }
              },
              "model": {
                "_attributes": {
                  "type": "virtio"
                }
              },
              "source": {
                "_attributes": {
                  "bridge": "br0.14"
                }
              },
              "target": {
                "_attributes": {
                  "dev": "vnet6"
                }
              }
            },
            "_attributes": {
              "type": "bridge"
            }
          }
        },
        {
          "serial": {
            "_content": {
              "source": {
                "_attributes": {
                  "path": "\/dev\/pts\/5"
                }
              },
              "target": {
                "_attributes": {
                  "port": "0"
                }
              }
            },
            "_attributes": {
              "type": "pty"
            }
          }
        },
        {
          "console": {
            "_content": {
              "source": {
                "_attributes": {
                  "path": "\/dev\/pts\/5"
                }
              },
              "target": {
                "_attributes": {
                  "port": "0"
                }
              }
            },
            "_attributes": {
              "tty": "\/dev\/pts\/5",
              "type": "pty"
            }
          }
        },
        "input",
        "graphics"
      ]
    },
    "vcpu": {
      "_content": "1"
    },
    "name": {
      "_content": "dev-ots02"
    },
    "memory": {
      "_content": "2048000"
    },
    "clock": {
      "_attributes": {
        "offset": "utc"
      }
    },
    "os": {
      "_content": {
        "type": {
          "_content": "hvm"
        },
        "boot": {
          "_attributes": {
            "dev": "hd"
          }
        }
      }
    },
    "uuid": {
      "_content": "46a3694d-605e-84f4-1411-d3a49d67cbdf"
    },
    "on_crash": {
      "_content": "destroy"
    },
    "features": {
      "_content": [
        "acpi"
      ]
    },
    "currentMemory": {
      "_content": "2048000"
    },
    "on_reboot": {
      "_content": "restart"
    },
    "on_poweroff": {
      "_content": "destroy"
    }
  },
  "_attributes": {
    "type": "kvm",
    "id": "4"
  }
}

libvirt domain xml

<domain type='kvm' id='4'>
	<name>dev-ots02</name>
	<uuid>46a3694d-605e-84f4-1411-d3a49d67cbdf</uuid>
	<memory>2048000</memory>
	<currentMemory>2048000</currentMemory>
	<vcpu>1</vcpu>
	<os>
		<type>hvm</type>
		<boot dev='hd'/>
	</os>
	<features>
		<acpi/>
	</features>
	<clock offset='utc'/>
	<on_poweroff>destroy</on_poweroff>
	<on_reboot>restart</on_reboot>
	<on_crash>destroy</on_crash>
	<devices>
		<emulator>/usr/bin/kvm</emulator>
		<disk type='file' device='disk'>
			<source file='/srv/kvm/dev-ots02/disk0.qcow2'/>
			<target dev='hda' bus='ide'/>
		</disk>
		<interface type='bridge'>
			<mac address='52:54:00:15:e9:80'/>
			<source bridge='br0.2'/>
			<target dev='vnet5'/>
			<model type='virtio'/>
		</interface>
		<interface type='bridge'>
			<mac address='52:54:00:d0:56:73'/>
			<source bridge='br0.14'/>
			<target dev='vnet6'/>
			<model type='virtio'/>
		</interface>
		<serial type='pty'>
			<source path='/dev/pts/5'/>
			<target port='0'/>
		</serial>
		<console type='pty' tty='/dev/pts/5'>
			<source path='/dev/pts/5'/>
			<target port='0'/>
		</console>
		<input type='mouse' bus='ps2'/>
		<graphics type='vnc' port='5902' listen='127.0.0.1'/>
	</devices>
</domain>

parse_xml_desc

    def parse_xml_desc(xml)
      # consumes the xml_desc blob from libvirt
      # produces an intermediate form composed of ruby hashes and arrays
      h = {}
      h["_attributes"] = n.attributes if n.attributes.keys.length > 0  
      case n.children.length
      when 0..1
        h["_content"] = n.content if n.content.length > 0
        h = nil unless (h["_content"] || h["_attributes"])
      else
        if %{ features devices }.include?(n.name)
          h["_content"] = n.children.collect do |c| 
            next if c.name.eql?("text")
            (c.children.length == 0 ? c.name : { c.name => parse_xml_desc(c) }) }).compact
          end
        else
          h["_content"] = {}
          n.children.each do |c|
            next if c.name.eql?("text")
            h["_content"][c.name] = parse_xml_desc(c)
          end
        end
      end
      h
    end