类正向声明失败，无递归包含

我正在使用VS2008，并在MFC中为一个学校项目进行开发。代码结构是由bouml 4生成的，当我想使用它时，出现了问题。我已经被错误C2061:语法错误：标识符"节点"卡住了几个小时，不知道如何解决它。这里是发生编译错误的地方。

Link.h

#pragma once
#include "model/MapIndicator.h"
#include "model/Highlightable.h"
class Node;
struct COORDINATE_AREA;
class Link : public MapIndicator {
public:
    explicit Link();
    Link(Node * node1, Node * node2); // Error on this line
protected:
    Link(const Link & source);
public:
    virtual ~Link(); 
...

节点.h

#pragma once
#include "model/MapIndicator.h"
#include <vector>
using std::vector;
#include "model/COORDINATE.h"
#include "model/Highlightable.h"
class Site;
struct COORDINATE_AREA;
//Node will be repaint several times in one refresh.
class Node : public MapIndicator {
public:
    explicit Node();
protected:
    Node(const Node & source);
public:
    virtual ~Node();
private:
    Node & operator=(const Node & source);
public:
    //This function will only add other node in its adjacent node list.
    //Note: Duplicate adding will have no effect.
    void addAdjNode(Node * otherNode);
    vector<Node *>::size_type getAdjNodeCount();
    //Remove specified node from its adjacent node list.
    //Return true if succeeds, Return false if that node doesn't exist in list.
    bool removeAdjNode(const Node * adjNode);
    //Add site which use this instance as reference node to referenced site list.
    void addRefSite(Site * refSite);
    vector<Site *>::size_type getRefSiteCount();
    //Remove specified site from its referenced site list.
    //Return true if succeeds, Return false if that site doesn't exist in list.
    bool removeRefSite(const Site * refSite);
    inline COORDINATE getNodeCoordinate() const;
    void setNodeCoordinate(COORDINATE value);
    //Draw itself according to the size and the coordinate of display area and its own coordinate.
    virtual void DrawInRect(const RECT & viewDispRect, const COORDINATE_AREA & mapDispCoordinate, CDC * pDC);
    //Return true if indicator have something to show in the coordinate area specified in parameter, otherwise return false.
    virtual bool VisibleInArea(const COORDINATE_AREA & mapDispCoordinate);
    //Return distance in double between screen position of this indicator and the screen point.
    virtual double DistanceInPixel(const RECT & viewDispRect, const COORDINATE_AREA & mapDispCoordinate, const CPoint & point);
    //Set display state directly.
    virtual void SetDispState(DispState dispState);
    //If hover is true and current state is normal, set state to hover.
    //If hover is false and current state is hover, set state to normal.
    //Otherwise no effect.
    virtual void SetHover(bool hover);
private:
    vector<Node *> adjNodes;
    vector<Site *> referencedSites;
    COORDINATE nodeCoordinate;
};
inline COORDINATE Node::getNodeCoordinate() const {
  return nodeCoordinate;
}

MapIndicator.h

#pragma once
#include "model/MapObject.h"
#include "model/Drawable.h"
#include "model/Locatable.h"
#include "model/Highlightable.h"
struct COORDINATE_AREA;
//This enum specifies different kinds of indicators available to identify.
enum IndicatorType {
  Road,
  Link,
  Node,
  Site
};
//MapIndicator is a artifact on map given varies kinds of hint to user.
class MapIndicator : public MapObject, public Drawable, public Locatable, public Highlightable {
public:
    explicit MapIndicator(IndicatorType indicatorType);
...

MapObject、Drawable、Locatable和Highlightable的标头中没有include语句，只有#pragma一次。

以及领先的编译输出：

1>Link.cpp
1>c:projectmodellink.h(12) : error C2061: syntax error : identifier 'Node'
1>c:projectmodellink.h(12) : error C2535: 'Link::Link(void)' : member function already defined or declared
1>        c:projectmodellink.h(11) : see declaration of 'Link::Link'

事实上，这个错误在我的项目中随处可见，但为什么呢？我使用的是指针，没有递归包含。