[libvirt] Network XML Description

Hi all, The XML description of a network does not contain information of the Domains (VMs) plugged into a network. For example, there is a network named 'default' and there are two domains named: domainA and domainB. The Network XML description of 'default' network cannot tell what domains are plugged into it (in this scenario: domainA and domainB). What reasons could be behind this Network XML format convention? Thanks, Fawad