#!/usr/bin/env python3

import xml.etree.ElementTree as ET
import sys

if len(sys.argv) < 3:
    print("Usage xpath.py file expression [attributes]")
    sys.exit(1)

def to_string(element, attrs):
    if attrs:
        d = element.attrib
        return ",".join(d.get(a, '-') for a in attrs)
    return str(ET.tostring(element))

with open(sys.argv[1]) as fin:
    print('\n'.join((to_string(i, sys.argv[3:]) for i in ET.parse(fin).findall(sys.argv[2]))))