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In virsh we quite often get the domain XML just to initialize the XPath parser so that we can extract information. Add helpers which will simplify this by wrapping the getting of the XML and parsing it along with error reporting. Additionally a second helper also gets the domain object from the parameters and releases it so that functions which need the XML as only source of data can be simplified further.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>