diff -ur old/writerfilter/inc/resourcemodel/WW8ResourceModel.hxx new/writerfilter/inc/resourcemodel/WW8ResourceModel.hxx
--- old/writerfilter/inc/resourcemodel/WW8ResourceModel.hxx	2011-12-01 22:48:21.000000000 +0800
+++ new/writerfilter/inc/resourcemodel/WW8ResourceModel.hxx	2012-06-25 21:41:41.481711000 +0800
@@ -138,6 +138,7 @@
     */
     virtual void sprm(Sprm & sprm) = 0;
     
+    virtual ~Properties(){}
 };
 
 /**
@@ -154,6 +155,8 @@
        @param ref     reference to properties of the entry
      */
     virtual void entry(int pos, writerfilter::Reference<Properties>::Pointer_t ref) = 0;    
+
+    virtual ~Table() {}
 };
 
 /**
@@ -171,6 +174,8 @@
      */
     virtual void data(const sal_uInt8* buf, size_t len,
                       writerfilter::Reference<Properties>::Pointer_t ref) = 0;
+
+    virtual ~BinaryObj(){}
 };
 
 /**
@@ -271,6 +276,8 @@
        @param info     the information
      */
     virtual void info(const string & info) = 0;
+
+    virtual ~Stream() {}
 };
 
 /**
@@ -322,6 +329,8 @@
        Returns string representation of this value.
      */
     virtual string toString() const = 0;
+
+    virtual ~Value() {}
 };
 
 /**
@@ -373,6 +382,8 @@
        Returns string repesentation of sprm.
      */
     virtual string toString() const = 0;
+
+    virtual ~Sprm() {}
 };
 
 /**