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Asked: 2026-06-10T00:07:06+00:00

I saw this tutorial for writing a JSON-RPC server for SWI-Prolog. Unfortunately, all it

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I saw this tutorial for writing a JSON-RPC server for SWI-Prolog. Unfortunately, all it does is add two numbers. I’m wondering if there exists a RPC server for SWI-Prolog that can define new rules and answer general Prolog queries, returning JSON lists, etc?

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  1. Editorial Team

    When you take a tour on SWI-Prolog website, proudly self-powered, you can see at work some of the features offered by http package.

    It’s a fairly large range of tools, and to grasp the basic of the system, the easiest way it’s to follow the specific How to section, step by step. There is a small bug you should be aware in the LOD Crawler: add an option on line 42 of lod.pl:

    ...
    ;   rdf_load(URI2, [format(xml)]),
....

    or you will probably get

    Internal server error

    Domain error: content_type' expected, found text/xml;charset=UTF-8′

    when running the sample.

    An important feature of the IDE it’s the ability to debug the HTTP requests.

    When done with the HowTo, you can take a look to Cliopatria, dedicated to interfacing RDF to HTML. It come with a pirates demo, I must say I find it a bit too ‘crude’ for my taste, and I don’t know about YUI, used in the award winning MultimediaN project. Then I’ve used Bootstrap to gain a modern look for the front end, with appreciable result (I’m sorry I can’t – yet – publish it, need more time to engineering the system).

    HTH

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