XMLStarlet is a set of command line utilities (tools) to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for text files with UNIX grep, sed, awk, diff, patch, join, etc utilities.

XMLStarlet Features:
1. Check or validate XML files (simple well-formedness check, DTD, XSD, RelaxNG)
2. Calculate values of XPath expressions on XML files (such as running sums, etc)
3. Search XML files for matches to given XPath expressions
4. Apply XSLT stylesheets to XML documents (including EXSLT support, and passing parameters to stylesheets)
5. Query XML documents (ex. query for value of some elements of attributes, sorting, etc)
6. Modify or edit XML documents (ex. delete some elements)
7. Format or "beautify" XML documents (as changing indentation, etc)
8. Fetch XML documents using or ftp:// URLs
9. Browse tree structure of XML documents (in similar way to ls command for directories)
10. Include one XML document into another using XInclude
11. XML c14n canonicalization
12. Escape/unescape special XML characters in input text
13. Print directory as XML document
14. Convert XML into PYX format (based on ESIS - ISO 8879), and vice versa

The license of this software is Free, you can free download and free use this file converter software.