The following functions of the [http://www.w3.org/TR/xpath-functions-31/ XQuery 3.1 Functions and Operators] Working Draft have already been implemented:
<code>fn:contains-token</code>, <code>map:contains</code>, <code>map:entry</code>, <code>map:get</code>, <code>map:keys</code>, <code>map:new</code>, <code>map:remove</code>
New signatures have been added for the following functions:
* Support for JSON: <code>fn:json-doc</code>, <code>fn:parse-json</code>
* Comparison of <code>xs:hexBinary</code> and <code>xs:base64Binary</code> items
* <code>fn:collation-key</code>, <code>fn:contains-token</code>, <code>fn:parse-ietf-date</code>, <code>map:for-each-entry</code>
* <code>format-number</code>: support for scientific notation
* <code>fn:string</code>: support for sequences and arrays