Parse a <checksum> object

def _parse_tree(self, node):
        """ Parse a <checksum> object """
        if 'filename' in node.attrib:
            self.filename = node.attrib['filename']
        if 'type' in node.attrib:
            self.kind = node.attrib['type']
        if 'target' in node.attrib:
            self.target = node.attrib['target']
        self.value = node.text