mergeindicator.py

import sys

from lxml import etree

root = etree.parse(sys.argv[1])

actual_results = {}

for num, result in enumerate(list(root.iter("result"))):
    title = num
    title_element = result.find("title")
    if title_element is not None:
        narrative_element = title_element.find("narrative")
        if narrative_element is not None:
            title = narrative_element.text.strip()

    if title in actual_results:
        result_element = actual_results[title]
        for indicator_element in result.iter("indicator"):
            result_element.append(indicator_element)
        result.getparent().remove(result) 
    else:
        actual_results[title] = result

print(etree.tostring(root, pretty_print=True).decode())