[libvirt] Report guest IPs as XML or struct?

I've proposed both approaches in the past. However, none of them was accepted as we ought to agree on $subj first. Frankly, both makes sense to me, both has advantages and disadvantages. XML - keeps things more consistent as libvirt is tied to XML, right? Pros: - can add items over the time Cons: - more complicated to parse and dump info (apps would have to query multiple XPATHs to get answer - at least with my implementation I've sent) struct - it would be a linked list or array of structs in fact Pros: - easier to dump useful data Cons: - once struct is released we cannot change it if we don't want to break ABI. What things do we want to expose for now? qemu guest agent reports: - type of IP address (v4/v6) - prefix length - actual address (string) (these can repeat multiple times, since there's 1:* relationship between interface an IP addresses) - hw address - name as seen within guest (HW address can be omitted - not all interfaces must have one). The only element that will be there for sure is name then. The whole QAPI schema can be found in qapi-schema-guest.json [1]. Suggestions are welcome. Michal 1: http://git.qemu.org/?p=qemu.git;a=blob;f=qapi-schema-guest.json;h=ed0eb69...