#!/usr/bin/python
#
# Copyright (c) 2001, Brian St. Pierre
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose, without fee, and without a written agreement
# is hereby granted, provided that the above copyright notice and this
# paragraph and the following two paragraphs appear in all copies.
#
# IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
# INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST
# PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
# EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
# BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#

import xml.parsers.expat
import sys, string

g_in_desired_field = 0

def start_element(name, attrs):
    global g_fieldname, g_in_desired_field
    if name == g_fieldname:
        g_in_desired_field = 1
    
def end_element(name):
    global g_fieldname, g_in_desired_field
    if name == g_fieldname:
        g_in_desired_field = 0

def char_data(data):
    global g_fieldname, g_in_desired_field
    if g_in_desired_field:
        print data

p = xml.parsers.expat.ParserCreate()

p.StartElementHandler = start_element
p.EndElementHandler = end_element
p.CharacterDataHandler = char_data

if len(sys.argv) == 2:
    # No filename, read from stdin.
    f = sys.stdin
    g_fieldname = sys.argv[1]
else:
    # Got filename
    filename = sys.argv[1]
    f = open(filename)
    g_fieldname = sys.argv[2]

p.ParseFile(f)