neon: git for structured data [Was: Functional database]

[Amirouche Boubekki]

I tried chez scheme and I think GNU Guile
is a better platform for what I am trying
to achieve, so I am back.

I also know better what I want to achieve.
I will create a triple store that comply
with semantic web standard that is
a RDF triple store. At [0] and [1] you will
find a primer on what is RDF in the former
and the concepts in the latter.

[0] https://www.w3.org/TR/rdf11-primer/
[1] https://www.w3.org/TR/rdf11-concepts/

It will also be branch-able etc... like git.

Also, I also plan to implement sparql.
If you find sparql difficult I recommend
the tutorial at data.world [2] in the mean time.
It's not very difficult and looks like SQL.
Hence I also plan to implement sparql [3].

[2] https://docs.data.world/tutorials/sparql/
[3] https://www.w3.org/TR/sparql11-overview/

What I want to do is something similar to data.world,
that is a gitlab-like platform for data and replace
the use of git in projects like datahub.io [4].

[4] http://datahub.io/core/registry

Enough talking, what is the status? Well I finished
porting what I had in chez and can now run the following
scenario:

- In master branch, I commit two triples

- In other branch, that is orphan branch, I commit
  two triples among where one of them overlaps with
  master.

- I can query both branch

- In a merge commit, I fix the conflict between both
  branch.

- I can query the resulting branch and get the expected
  result.

The code might be easier to read [5]

[5] https://github.com/amirouche/neon/blob/master/guile/neon.scm

What is missing, in order of difficulty:

- microkanren package
  https://framagit.org/a-guile-mind/microkanren

- wiredtiger 3 package

- Turtle aka. .ttl format parser https://www.w3.org/TR/turtle/

- sparql queries parser https://www.w3.org/TR/rdf-sparql-query/

- I am not sure of the status of guile-squee yet
  https://notabug.org/cwebber/guile-squee/

- pluggable backends

If you want to work one of this item, send me an email.

What I plan to work on next:

  There is a semantic difference between neon
  and RDF triple stores. In a triple store you
  can have as many times as you want the same
  attribute given a subject. That is (ref subject)
  doesn't return a proper alist.

There is two other links that remain to be cited

- https://www.w3.org/TR/rdf11-mt/

- https://www.w3.org/TR/2014/NOTE-rdf11-datasets-20140225/

Happy hacking,


--
Amirouche ~ amz3 ~ http://www.hyperdev.fr