Re: URDNA2015 Implementation Question

Hi Team ,

I am also working on similar kind of implementation but i am more looking
if we have Java implementation of this .


Could someone help me with that if there is any java implementation ?

And i want to use the normalize function on offline mode.


Best Regards
Sethi shivam

On Fri, Jul 8, 2022, 7:04 AM Dave Longley <dlongley@digitalbazaar.com>
wrote:

>
> On 7/7/22 6:10 PM, Daniel Petranek wrote:
> > Hello, I'm working on implementing the RDF Dataset Canonicalization
> > algorithm[0], using the https://github.com/digitalbazaar/rdf-canonize
> > <https://github.com/digitalbazaar/rdf-canonize> implementation as a
> > reference.
>
> Hi Daniel!
>
> >
> > I've got an implementation with all the tests passing except evil(1),
> > evil(2), and evil(3), and I was wondering if you could clarify a point
> > for me - step 5.4 of the Hash N-Degree Quads algorithm which states:
> > "For each permutation of blank node list:".
> >
> > I've instrumented the rdf-canonicalize library so I can inspect the
> > order of execution, and it appears that what differs between my
> > implementation and the Javascript one is the order of the permutations.
> > The spec doesn't say how the permutations should be ordered, and my
> > intuition is that the order does indeed matter - though I'm happy to be
> > corrected if I'm wrong.
> >
> > So, here is my question(s):
> > - Does the order of the permutations matter?
> > - If so, what order should they be in?
>
> Nope, the permutation order should not matter. So I would expect there
> to be some other deviation in your implementation from the algorithm.
>
> >
> > The ref-canonicalize library implements the Steinhaus-Johnson-Trotter
> > algorithm, which I'm happy to do as well if necessary. But if the
> > specific order matters I think it should be a part of the spec.
>
> Nope, as long as you cover all the permutations, they can be in any
> order. You may find it easier to debug if you use the same permutation
> algorithm, but it's not necessary for correctness.
>
> Good luck!
>
>
> --
> Dave Longley
> CTO
> Digital Bazaar, Inc.
>
>