lojix/logic/src/main/com/thesett/aima/logic/fol/BasePositionalVisitor.java
public void visit(Variable variable)
    {
        if (traverser.isEnteringContext())
        {
            enterVariable(variable);
        }
        else if (traverser.isLeavingContext())
        {
            leaveVariable(variable);
            variable.setTermTraverser(null);
        }
    }
public void visit(Variable variable)
    {
        if (traverser.isEnteringContext())
        {
            enterVariable(variable);
        }
        else if (traverser.isLeavingContext())
        {
            leaveVariable(variable);
            variable.setTermTraverser(null);
        }
    }
{@inheritDoc}