Returns the column path for the current item.  This will be a '.'
        joined path based on the root schema to the given column.
        
        :return     <str>

def currentSchemaPath(self):
        """
        Returns the column path for the current item.  This will be a '.'
        joined path based on the root schema to the given column.
        
        :return     <str>
        """
        item = self.currentItem()
        path = []
        while item:
            path.append(nativestring(item.text(0)))
            item = item.parent()
        
        return '.'.join(reversed(path))