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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 ``SaltLabel`` from an etree element representing a label element in a SaltXMI file. A label element in SaltXMI looks like this:: <labels xsi:type="saltCore:SFeature" namespace="salt" name="SNAME" value="ACED0005740007735370616E3139" valueString="sSpan19"/> Parameters etree_element : lxml.etree._Element an etree element parsed from a SaltXMI document """

        return cls(name=etree_element.attrib['name'],
                   value=etree_element.attrib['valueString'],
                   xsi_type=get_xsi_type(etree_element),
                   namespace=etree_element.attrib.get('namespace'),
                   hexvalue=etree_element.attrib['value'])