/*
    Item
    |
    |
    ------- Object
    |
    |------ Link
*/

class Item
{
public:
    World *world() = 0;
};

//-----------------------------------------------

class Object : public Item
{
public:
    virtual ObjectValue calculate() = 0;
    virtual void connectTo(const QString &objectId, const QString &linkDefId) = 0;
};

//-----------------------------------------------

class Link : public Item
{
public:
    virtual QString fromObjectId() const = 0;
    virtual QString toObjectId() const = 0;
    virtual QString linkDefId() const = 0;
};

class ClientObject : public Object
{
    //...
};

//-----------------------------------------------

class ClientLink : public Link
{
    //...
};

class ServerObject : public Object
{
    //...
};

//-----------------------------------------------

class ServerLink : public Link
{
    //...
};