template class XML parser

I wrote a template class that inherits from the PUG xml_tree_walker
class so that I can load data from any XML file without having to
write a parser for each one.

template <class T>
class CGenericXMLWalker : public pug::xml_tree_walker
{
    T* m_pData;

public:

    CGenericXMLWalker(T* pDataIn);

    ~CGenericXMLWalker();

    T* GetData() {m_pData->AddRef(); return m_pData;}

    //Traversal begin callback.
               bool begin(pug::xml_node& node);

    //Traversal node callback; cumulatively outputs a simple document
outline.
    bool for_each(pug::xml_node& node);

    //Traversal end callback.
    bool end(pug::xml_node& node);

    bool traverse(pug::xml_node& node);

    VOID AddNodeAttributes(pug::xml_node& node);
};

It calls a function that I have defined in another file that accepts
an xml node and determines which class to pass to the template based
on the name of the xml node.

PDataDefObject TraverseDataType(pug::xml_node & Node)
{
    if (Node.empty() || Node.has_attribute( "NoParse" ) )
        return NULL;

    PDataDefObject pDataDefObject = NULL;
    static TagMap mapObjectTypes;
    static std::vector<ULONG> aObjectCounts;

    if (mapObjectTypes.empty())
    {
        // fill map here

        mapObjectTypes["AbilityBonus"] = DATA_TYPE_ABILITY_BONUS;
        mapObjectTypes["AbilityBonusOptions"] =
DATA_TYPE_ABILITY_BONUS_OPTION;
        // etc

    }

    if (aObjectCounts.empty())
    {
        aObjectCounts.assign(NUM_ELEMENTAL_DATA_TYPES, 0);
    }

    ULONG ulDataType = UNKNOWN_ELEMENTAL_DATA_TYPE;
    ULONG ulObjectCount = 0;

    TagMap::iterator itFind = mapObjectTypes.find(Node.name());
    if (itFind != mapObjectTypes.end())
    {
        ulDataType = (*itFind).second;

        ulObjectCount = aObjectCounts[ulDataType];

        switch(ulDataType)
        {
        case DATA_TYPE_ABILITY_BONUS:
        {
            PAbilityBonus pAbilityBonus = NULL;
            CGenericXMLWalker<CAbilityBonus> Walker(pAbilityBonus);
            if (Walker.traverse(Node))
            {
                pDataDefObject = (PDataDefObject) Walker.GetData();
            }
        }
        break;

        case DATA_TYPE_ABILITY_BONUS_OPTION:
        {
            PAbilityBonusOption pOption = NULL;
            CGenericXMLWalker<CAbilityBonusOption> Walker(pOption);
            if (Walker.traverse(Node))
            {
                pDataDefObject = (PDataDefObject) Walker.GetData();
            }
        }
        break;
        };
    }

    if (pDataDefObject)
    {
        pDataDefObject->SetDataTypeString(Node.name());
        pDataDefObject->SetDataType(ulDataType);

        ++ulObjectCount;
        aObjectCounts[ulDataType] = ulObjectCount;
    }

    return pDataDefObject;
}

It compiles OK, but I get linker errors:

error LNK2019: unresolved external symbol "public: virtual __thiscall
CGenericXMLWalker<class CAbilityBonusOption>::~CGenericXMLWalker<class
CAbilityBonusOption>(void)" (??1?
$CGenericXMLWalker@VCAbilityBonusOption@@@@UAE@XZ) referenced in
function "class CDataDefObject * __cdecl TraverseDataType(class
pug::xml_node &)" (?
TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)

error LNK2019: unresolved external symbol "public: bool __thiscall
CGenericXMLWalker<class CAbilityBonusOption>::traverse(class
pug::xml_node &)" (?traverse@?
$CGenericXMLWalker@VCAbilityBonusOption@@@@QAE_NAAVxml_node@pug@@@Z)
referenced in function "class CDataDefObject * __cdecl
TraverseDataType(class pug::xml_node &)" (?
TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)

error LNK2019: unresolved external symbol "public: __thiscall
CGenericXMLWalker<class CAbilityBonusOption>::CGenericXMLWalker<class
CAbilityBonusOption>(class CAbilityBonusOption *)" (??0?
$CGenericXMLWalker@VCAbilityBonusOption@@@@QAE@PAVCAbilityBonusOption@@@Z)
referenced in function "class CDataDefObject * __cdecl
TraverseDataType(class pug::xml_node &)" (?
TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)

error LNK2019: unresolved external symbol "public: virtual __thiscall
CGenericXMLWalker<class CAbilityBonus>::~CGenericXMLWalker<class
CAbilityBonus>(void)" (??1?
$CGenericXMLWalker@VCAbilityBonus@@@@UAE@XZ) referenced in function
"class CDataDefObject * __cdecl TraverseDataType(class pug::xml_node
&)" (?TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)

error LNK2019: unresolved external symbol "public: bool __thiscall
CGenericXMLWalker<class CAbilityBonus>::traverse(class pug::xml_node
&)" (?traverse@?
$CGenericXMLWalker@VCAbilityBonus@@@@QAE_NAAVxml_node@pug@@@Z)
referenced in function "class CDataDefObject * __cdecl
TraverseDataType(class pug::xml_node &)" (?
TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)

error LNK2019: unresolved external symbol "public: __thiscall
CGenericXMLWalker<class CAbilityBonus>::CGenericXMLWalker<class
CAbilityBonus>(class CAbilityBonus *)" (??0?
$CGenericXMLWalker@VCAbilityBonus@@@@QAE@PAVCAbilityBonus@@@Z)
referenced in function "class CDataDefObject * __cdecl
TraverseDataType(class pug::xml_node &)" (?
TraverseDataType@@YAPAVCDataDefObject@@AAVxml_node@pug@@@Z)
 : fatal error LNK1120: 6 unresolved externals

I've got all the proper files included, all my classes are defined,
and I just can't figure out why it's getting the linker errors. Does
anyone have any ideas?

Thanks.