•xml — XML text

•xml text reads XML into an element tree with the same meaning. Attribute values become text. Names keep their prefixes, and namespace declarations become xmlns attributes. Comments, processing instructions and text that is only whitespace are dropped. XML and SVG covers element trees.

•xml⁻¹ tree writes the XML text of an element tree. It escapes &, <, > and " in text and attribute values. A numeric vector attribute becomes space-separated numbers. Children are text, elements or vectors of children. An element with no children closes itself.

Errors: DOMAIN for malformed XML, and for invalid names or attribute values given to •xml⁻¹.