public abstract void save();
public abstract void saveHTML(string html);
public abstract string toSource() ;
public abstract void save();
public abstract void saveHTML(string html);
public abstract string toSource() ;
public abstract void setSource(string str);
public abstract string toSourcePreview() ;
public abstract void removeFiles() ;
public abstract void setSource(string str);
public abstract string toSourcePreview() ;
public abstract void removeFiles() ;