add custom namespaces

[tzapu]

first part of #10

[tzapu]

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[tzapu]

hi, the above should fix #10 and #11
if you could take a look @boutros it would be great
for #11 it seems spaces after : were ok, the problem was with tabs and newlines. if you can see a better way to do it please let me know

[boutros]

Thanks, will review soon!

[boutros]

I think I would prefer to just export the TripleEncoder.ns map, and avoid expanding the API surface with another exported type.

Is there a reason something like this would not suffice?

3b6ca9d

[tzapu]

hi, that was my first attempt as well, the end result of that if i read it correctly and from what i can remember was that the custom prefixes were not actually written to file (it checks if namespace contains first, and only writes if it is not found, which of course it is because we set it previously)

[tzapu]

but of course, the type can be ommited and you can just use Namespaces as cNS and keep the ns.

i would really really like to somehow keep the flag related to only namespacing if a custom namespace is found, it just makes everything better :D (in our case)

do you want me to modify the pull request as i described and per your instructions?

[tzapu]

hi @boutros , i modified it some more, hopefully it is more along the lines of what you want now

thank you again for looking into this

[boutros]

Thanks! I'm fine with a flag which turns off auto-generated namespaces.
Could I ask you to squash everything into one commit, but exclude the parts about #11, and open a separate pull-request for that?
If you are not comfortable with rebasing, I will do it, no problem.

[tzapu]

ok, i ll try :d

[tzapu]

i think i sorted it, please take a look,
Thanks

[boutros]

Great, thanks!