A very simple tool to decode xml. Python's Tkinter library used to build the interface. Python3^ is required.

xml-decoder.py

import html
from tkinter import *
import xml.dom.minidom as dom

# author Al Imran Ahmed
# A very simple interface to decoded xml. i.e. &lttag&gt => <tag>
# requires python3^ with tkinter GUI library installed

class Application(Frame):
    def decode_xml(self):
        contents = self.textInput.get(1.0, END)
        print('Encoded XML:\n'+contents)
        decoded_xml = html.unescape(contents)
        print('Decoded XML:\n'+decoded_xml)
        try:
            parsed_xml = dom.parseString(decoded_xml) # or dom.parse(xml_string)
            pretty_xml = parsed_xml.toprettyxml()
        except Exception:
            print('Not valid XML')
            pretty_xml = decoded_xml

        self.textInput.delete(1.0, END)
        self.textInput.insert(END, pretty_xml)

    def createWidgets(self):
        self.QUIT = Button(self)
        self.QUIT["text"] = "QUIT"
        self.QUIT["bg"]   = "red"
        self.QUIT["command"] =  self.quit

        self.QUIT.pack({"side": "top"})

        self.decode = Button(self)
        self.decode["text"] = "Decod-XML",
        self.decode["command"] = self.decode_xml

        self.decode.pack({"side": "top"})


        self.textInput = Text(self, width=600, height=600)
        self.textInput.pack({"side": "bottom"})

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.pack()
        self.createWidgets()

root = Tk()
app = Application(master=root)
root.minsize(900, 600)
root.wm_title('XML-Decode by Al Imran Ahmed')
app.mainloop()
root.destroy()