Convert OPML to JSON CSLJSON

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 JSON file extension, associated with CSL JSON (Citation Style Language JSON), is used to store and exchange bibliographic data. Commonly utilized in academic publishing and reference management tools, it allows for standardized citation and bibliography formatting. Originating from the need for a universal citation format in the early 2000s, CSL JSON has been widely adopted for its efficiency in organizing and sharing scholarly references. The format leverages the JSON structure for simplicity and compatibility across different systems.