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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 parsexml(self, xmlstring, modules, source=None):
 """Parses the docstrings out of the specified xml file. :arg source: the path to the file from which the XML string was extracted. """

        result = {}

        from fortpy.utility import XML_fromstring
        xmlroot = XML_fromstring(xmlstring, source)
        if xmlroot.tag == "fortpy" and "mode" in xmlroot.attrib and \
           xmlroot.attrib["mode"] == "docstring":
            #First, cycle through the kids to find the <global> tag (if any
            #exist). It's children will apply to any of the other tags we find
            #and we will have to update their attributes accordingly.
            xmlglobals = {}
            for child in xmlroot.iterfind("globals"):
                _update_globals(list(child), xmlglobals)
            _set_global_defaults(xmlglobals)
                
            #We fill the dictionary with decorates names as keys and lists
            #of the xml docstring elements as values.
            for child in xmlroot:
                if child.tag == "globals":
                    continue

                xmltags = []
                if child.tag == "decorates" and "name" in child.attrib:
                    decorates = child.attrib["name"]
                    xmltags.extend(list(child))
                elif "decorates" in child.attrib:
                    decorates = child.attrib["decorates"]
                    xmltags.append(child)

                for xtag in xmltags:
                    _update_from_globals(xtag, xmlglobals, child)

                if decorates in result:
                    result[decorates].extend(xmltags)
                else:
                    result[decorates] = xmltags

            #Loop through all the docstrings we found and team them up with
            #their respective module members.
            self._xml_update_modules(result, modules)