Convert OPML to HTML

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 HTML (Hypertext Markup Language) file extension, is a fundamental file format in web development. It structures content on the web through the use of tags to create elements such as headings, paragraphs, links, and images. Originating from Tim Berners-Lee's work at CERN in the early 1990s, HTML has evolved to become the cornerstone of web design and development, facilitating the creation of dynamic and interactive web pages. HTML files are essential for displaying and structuring web content, ensuring a seamless user experience across various browsers and devices.