private static boolean isOperatorVariableAccess(final INaviOperandTreeNode node){
  final List<INaviOperandTreeNode> children=node.getChildren();
  if (children.size() == 2) {
    final INaviOperandTreeNode child0=children.get(0);
    final INaviOperandTreeNode child1=children.get(1);
    return isVariable(child0) ^ isVariable(child1);
  }
 else {
    return false;
  }
}

private static boolean isOperatorVariableAccess ( final INaviOperandTreeNode node ) { final List < INaviOperandTreeNode > children = node . getChildren ( ) ; if ( children . size ( ) == 2 ) { final INaviOperandTreeNode child0 = children . get ( 0 ) ; final INaviOperandTreeNode child1 = children . get ( 1 ) ; return isVariable ( child0 ) ^ isVariable ( child1 ) ; } else { return false ; } }
determines whether a given node is a variable access node that can be simplified .
