NAME

       CQL::Node - base class for nodes in a CQL parse tree

SYNOPSIS

           n/a

DESCRIPTION

       All the CQL node classes inherit from CQL::Node. CQL::Node essentially gurantees that its
       children implements some methods.

   toCQL()
   toXCQL()
   toSwish()
   toLucene()
   clone()
       Creates a copy of a node, and it's children. Useful if you want to modify the tree but
       keep a copy of the original.