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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 load(self, filename):
 """Load a FoLiA XML file. Argument: filename (str):
 The file to load """

        #if LXE and self.mode != Mode.XPATH:
        #    #workaround for xml:id problem (disabled)
        #    #f = open(filename)
        #    #s = f.read().replace(' xml:id=', ' id=')
        #    #f.close()
        #    self.tree = ElementTree.parse(filename)
        #else:
        self.tree = xmltreefromfile(filename)
        self.parsexml(self.tree.getroot())
        if self.mode != Mode.XPATH:
            #XML Tree is now obsolete (only needed when partially loaded for xpath queries)
            self.tree = None