Python-сообщество

    <Name>x111</Name>
    <label>x222</label>
    <description>x333</description>
    <category>x444</category>
    <default>x555</default>
    

    <Name>y111</Name>
    <label>y222</label>
    <description>y333</description>
    <category>y444</category>
    <Style>y555</Style>
    <Over>y666</Over>
    <format>y777</format>

<x111.label>x222</x111.label>
    <x111.description>x333</x111.description>
           
    <y111.label>y222</y111.label>
    <y111.description>y333</y111.description>
    

import re
o = open('text.txt', 'w')
x = re.findall('<Name>(.*)</Name>', o)
re.sub('label>.*</label>', '<(x).(\1)', o)
re.sub('</label>', '</(x).(\1)', o)
o.close()