Convert OPML to TEIXML

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 TEIXML file extension refers to the Text Encoding Initiative XML (TEI XML), a standardized format for encoding texts in the humanities and social sciences. Developed in the 1980s, TEI XML facilitates the digital representation of texts, enabling detailed markup of structural, semantic, and presentational features. It is widely used for creating and sharing digital editions of texts, ensuring interoperability and preservation. TEI XML is an application of Extensible Markup Language (XML), that provides a flexible and robust framework for text encoding.