xMarkup is a command line and GUI utility for multipurpose processing of a set of text files. It can be used to generate or edit the navigational cross-references within a set of HTML documents, analyze and convert the structure or content of SGML, XML, HTML, or text documents, split or merge text files with specified rules, analyze and extract data, generate scripts, and more. xMarkup supports a built-in procedural language which may be used to describe rules of the processing. This language is a simple dialect of the Icon programming language.Changes: New functions for procedural macros were added. Found bugs were fixed. The CLI and GUI were updated. A feature was added to build a binary .exe file for markup rules to speed up the processing by 10 or more times.