Check or validate XML files (simple well-formedness check, DTD, XSD, RelaxNG)

Calculate values of XPath expressions on XML files (such as running sums, etc)

Search XML files for matches to given XPath expressions

Apply XSLT stylesheets to XML documents (including EXSLT support, and passing parameters to stylesheets)

Query XML documents (ex. query for value of some elements of attributes, sorting, etc)

Modify or edit XML documents (ex. delete some elements)

Format or "beautify" XML documents (as changing indentation, etc)

Fetch XML documents using http:// or ftp:// URLs

Browse tree structure of XML documents (in similar way to 'ls' command for directories)

Include one XML document into another using XInclude

XML c14n canonicalization

Escape/unescape special XML characters in input text

Print directory as XML document

Convert XML into PYX format (based on ESIS - ISO 8879), and vice versa