Convert OPML to TXT CREOLE

OPML, or Outline Processor Markup Language, is a file format utilized primarily for outlining data structures. Initially developed in 2000 by UserLand Software, OPML was designed to facilitate the exchange of outline-based information between different software applications. Its uses have expanded over time, notably in organizing RSS feed lists and managing hierarchical data. The OPML file extension denotes XML-based documents that offer simplicity and interoperability in transferring structured information across diverse platforms. In essence, OPML serves as a versatile tool in the realm of data organization and syndication.

The TXT file extension represents Creole Markup Language (CML), which is a lightweight markup language designed to standardize wiki syntax, facilitating content transfer between different wiki engines. Conceived during the 2006 International Symposium on Wikis, Creole amalgamates common elements from major wiki engines, with MediaWiki's syntax often used as a fallback. Released as version 1.0 on July 4, 2007, Creole is supported by various wiki platforms, including Bitbucket wikis and Moodle. It simplifies content creation and editing across diverse wiki environments.