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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_etree(cls, etree_element):
 """ creates a `SaltElement` from an `etree._Element` representing an element in a SaltXMI file. """

        label_elements = get_subelements(etree_element, 'labels')
        labels = [SaltLabel.from_etree(elem) for elem in label_elements]
        return cls(name=get_element_name(etree_element),
                   element_id=get_graph_element_id(etree_element),
                   xsi_type=get_xsi_type(etree_element),
                   labels=labels,
                   xml=etree_element)