public void populateSymbolTable()
        {
            if (m_schemaHeader != null)
                {
                m_schemaHeader.populateSymbolTable();
                }
            if (m_declaration != null)
                {
                m_declaration.populateSymbolTable();
                }
            if (m_predicateList != null)
                {
                m_predicateList.populateSymbolTable();
                }
        }