Add ports for eXist-db and Saxon

[adamretter]

Closes #8

1. I wasn't quite sure about this one - 1ef3be2
2. I have tested the eXist-db port with just a simple XML Doc and Schematron, and was able to get SVRL using:

   import module namespace xqs = 'http://www.andrewsales.com/ns/xqs' at 'xmldb:exist:///db/xqs/xqs.xqm';
   xqs:validate(doc('/db/xqs/test/foo.xml'), doc('/db/xqs/test/assertion-message-braces.xml')/*)

3. I haven't tested the Saxon port.

If you can tell me how to run the BaseX test suite from the command line and determine if it fails or passes (by exit code?), then I could also add GitHub Actions CI to run tests for this against BaseX and eXist-db.

[AndrewSales]

Thanks so much, @adamretter !
You're right about @queryBinding.
I'll add instructions to the README for running tests - really appreciate your help here.

[AndrewSales]

Ah... in the BaseX docs, it says:

"The three functions fn:transform, fn:load-xquery-module and fn:collation-key may be added in a future version of BaseX as their implementation might require the use of additional external libraries."

[adamretter]

Thanks so much, @adamretter !

@AndrewSales you are very welcome :-)

I'll add instructions to the README for running tests - really appreciate your help here.

Let me know when you have that, and if you would like, I can send a PR to get CI testing this against eXist-db and BaseX.

[adamretter]

"The three functions fn:transform, fn:load-xquery-module and fn:collation-key may be added in a future version of BaseX as their implementation might require the use of additional external libraries."

Oh dear! Apologies, I was under the impression that BaseX supported all XQuery 3.1 functions.
I would think that BaseX could implement fn:load-xquery-module without adding any additional libraries, at least that was my experience with this in eXist-db.

Maybe we can ask @ChristianGruen if that is possible for the next version of BaseX? If not, perhaps we have to adjust my changes to make it a manual choice for the user as to which port module to use.

[AndrewSales]

Oh dear! Apologies, I was under the impression that BaseX supported all XQuery 3.1 functions.

No problem! Me too.

Maybe we can ask @ChristianGruen if that is possible for the next version of BaseX?

I'll ask on the BaseX forum.

If not, perhaps we have to adjust my changes to make it a manual choice for the user as to which port module to use.

Sure.

BTW, instructions for the test suite are here, if you do have time to take a look: https://github.com/AndrewSales/XQS#running-the-test-suite.

Thanks again.

[adamretter]

Thanks Andrew. I heard informally that BaseX may be able to address the module load issue soon... So hopefully that will help with this

[ChristianGruen]

Hi together, we’ll add an implementation of fn:load-xquery-module in BaseX 11, which is planned for Summer/Fall this year. A proof-of-concept implementation will be made available with BaseX 10.7 or 10.8.

[AndrewSales]

Amazing, Christian - thank you so much, I can see this being of general benefit to the BaseX user base. Hope you were able to have a decent break :-) Andrew

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