r-cran-xml 3.99-0.3-1 (amd64 binary) in ubuntu focal

 This package provides facilities for the R language to
 .
  * parse XML files, URLs and strings, using either the DOM (Document
    Object Model)/tree-based approach, or the event-driven SAX (Simple
    API for XML) mechanism;
  * generate XML content to buffers, files, URLs, and internal XML trees;
  * read DTDs as R objects.