Convert OPML to TEX

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.

TEX is the file extension for TeX documents, a typesetting system used for creating professional-quality documents, primarily in academic and technical fields. It was developed by Donald Knuth in the late 1970s to improve the appearance of mathematical and scientific papers. TeX is known for its precision and ability to handle complex formatting. LaTeX, built on top of TeX, simplifies document creation by providing a set of macros and templates for common document structures, making it easier to produce consistent, high-quality output.