[libvirt-users] New vs old API usages

Hi, Currently I am using the latest libvirt API listAllDomains() to probe for domains. I may need to fall back to older API for old libvirt server such as: listDefinedDomains() and lookupByName() instead of listAllDomains(). Is there any disadvantage to using listAllDomains instead of listAllDomains or its the same results via different API? Thank you, Shahar.