SMI parser
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SNMP MIBs are written in two kinds of special language - SMIv1 and
SMIv2. The first SMI version is obsolete, most MIBs by now are written
in SMIv2 grammar. There are also efforts aimed at improving SMIv2, but
those MIBs are in great minority at the time of this writing.

PySMI is designed to handle both SMIv1 and SMIv2. The way it is done
is that SMIv2 is considered the most basic and complete, whereas SMIv1
is a specialization of SMIv2 syntax.

For a user to acquire SMIv2 parser the *parserFactory* function should
be called with the SMI dialect object.

The parser object should be passed to the MibCompiler object.

Note:

  Please, note that *parserFactory* function returns a class, not
  class instance. Make sure to instantiate it when passing to
  MibCompiler class constructor.
