About how to discriminate whether the libvirt package includes incompatibility problems or not.

Issue

• Does Red Hat provide the program for discriminating whether the version of the package is older or newer?
• The way to confirm by using the commands included in RHEL such as rpm(1).
• The way to confirm by using a program written in C.
• The way to confirm by using a program written in Python.
• "rpm" command right for discriminating whether the version of the package is older or newer?

Ex) How to compare the version of libvirt-0.9.4-23.el6_2.4 and 
    libvirt-0.9.4-23.el6

  # rpm --eval '%{lua:print(rpm.vercmp("0.9.4-23.el6_2.4","0.9.4-23.el6"))}'
  1

Output result(is the following right?)
  -1: the version of first argument is earlier.
   0: the version of packages are same. 
   1: the version of first argument is later.

• Is the above usage supported by Red Hat?