[xquery-talk] What are people doing about XQJ?

Christian Grün christian.gruen at gmail.com
Sat Mar 17 03:47:49 PDT 2018

Hi Michael,

As far as I know, most XQuery processors (such as ours) currently rely on
Charles Foster’s XQJ implementation.

In the past, we had our own implementations, but we stopped maintaining it
some years ago. Users keep asking us why they cannot use XQuery 3.1 with
XQJ; due to the unfortunate licensing conditions you mentioned, we didn’t
invest more time in this.


Michael Kay <mike at saxonica.com> schrieb am Fr., 16. März 2018, 00:58:

> XQJ provides a common Java API for XQuery processors.
> For some reason it got tied up in far more legal red tape than most
> standards: probably something to do with the great Oracle/Google lawsuits.
> There is no work being done to extend XQJ to work with XQuery 3.0 or 3.1,
> and the XQJ license explicitly prohibits any third party from extending the
> interface to provide such support.
> So what is one supposed to do if someone executes a query that returns a
> map or array? One interpretation of the rule prohibiting extensions is that
> the only thing an XQJ implementation can legally do in this case is to
> throw an error.
> I'm interested to know how other XQuery implementors are handling this.
> Should we just let XQJ die and forget it ever existed?
> Michael Kay
> Saxonica
> _______________________________________________
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