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Oxygen XML Editor offers an add-on that provides the entire ICU4J JAR library used for sorting and collations with XSLT processors. The Saxon 9 XSLT processor has an xsl:sort element that can be used to sort elements based on their text content. If the XML elements contain text in exotic languages, Saxon needs a more powerful sort algorithm and this JAR library adds this capability.

To install it the add-on, follow these instructions:
  1. Go to Help > Install new add-ons to open an add-on selection dialog box.
  2. Enter or paste https://www.oxygenxml.com/InstData/Addons/default/updateSite.xml in the Show add-ons from field or select it from the drop-down menu.
  3. Select the Contribute ICU4J Library add-on and click Next.
  4. Select the I accept all terms of the end user license agreement option and click Finish.
  5. Restart the application.

Result: The ICU4J library is now contributed to the Oxygen installation directory.

For more information, see the details for this Contribute ICU4J Library add-on in GitHub.