switch(operator.getKind()){
case NEG: break;
case NOT:
if (operandNodeData.xpathExpr != null){
XpathNotExpression xpathNotExpr = xpathFactory.createNotExpression();
xpathNotExpr.setExpr(operandNodeData.xpathExpr);
unaryOperatorContext.xpathExpr = xpathNotExpr;
unaryOperatorContext.variable = operandNodeData.variable;
}
break;