Check the instructions at

https://www.saxonica.com/documentation13/index.html#!v4extensions/enable-qt4

for how to enable 4.0 capability.

Michael Kay
Saxonica

> On 8 Oct 2026, at 18:28, Graydon graydon@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Thu, Oct 08, 2026 at 05:07:37PM +0000, Martin Honnen martin.honnen@xxxxxx
<mailto:martin.honnen@xxxxxx> scripsit:
>> On 08/10/2026 18:53, Martin Honnen martin.honnen@xxxxxx wrote:
>>> I think with commercial editions of Saxon 13 (EE/PE) available for
>>> oXygen as a plugin there is support for the 4.0 function
>>>
https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-hash
>>
>>
>> For me with oXygen 28.1 and Saxon EE 13 installed as a plugin it indeed
>> works to use e.g.
>>
>> xquery version '4.0'; hash('XPath 4.0 is great!')
>>
>> in the XPath/XQuery builder (with the Saxon EE 13 engine selected):
>>
>> <?xml version="1.0" encoding="UTF-8"?>E0A436C140ED7CA474D16450D7226EF4
>
> Oddly, if I remember to change the @version on the XSLT stylesheet to 4
> and the engine in the transformation scenarion to Saxon EE 13, hash()
> works in the XSLT stylesheet I want it for, while in the XPath/XQuery
> builder, your example does not work.
>
> I get told there isn't a 1-argument hash function. Which is a surprise.
> The example works fine in BaseX, so I'm going to presume there's no
> syntax issue introduced by a helpful mail transport agent or my
> ineptitude.
>
> I haven't gone and adjusted anything in oXygen about making EE 13 the
> default for XQuery, which would be my first guess as to why selecting it
> as the engine for the query isn't efficacious. (oXygen has been
> restarted.)
>
> I am using the latest oXygen 28.1, so hopefully that's not it.
>
> But, it works in XSLT, so success!
>
> Thank you!
>
> --
> --
> Graydon Saunders  | graydonish@xxxxxxxxxxxx
<mailto:graydonish@xxxxxxxxxxxx>
> \xDE\xE6s ofer\xE9ode, \xF0isses sw\xE1 m\xE6g.
> -- Deor  ("That passed, so may this.")