Device Manager : Managing devices : Importing and exporting device lists : Metadata file format
 
Metadata file format
ADOMs, devices, and groups may have metadata associated with them. Their values are specified by +meta lines following the device, group, or ADOM. You can use multiple lines to specify multiple metadata values.
+meta|name|value|
Field Name
Blank Allowed
Description
name
No
The name of the metadata.
value
No
The associated value.