Enable requests for versioned entities about registry-core HOT 12 OPEN

See https://groups.google.com/d/msg/ukgovld-software/LDwH9_b2sYc/i_PN-KlRJ4MJ

from registry-core.

Feature requests:
(1) enable _versionAt for entities, as well as registers
(2) arrange for a request for version of an entity to return something more helpful than a 404

See discussion at https://groups.google.com/forum/#!msg/ukgovld-software/LDwH9_b2sYc/i_PN-KlRJ4MJ for more detail.

from registry-core.

As noted in that discussion the notion of versioned entity resources is a little at odds with the current model. Technically implementable, but the conceptual model is less clear.

Would require agreement from at least Jeremy.

from registry-core.

@der & @dr-shorthair ... would it be ok to come back to this after the christmas break or is this a pressing issue?

from registry-core.

I will do nothing on this before or during Christmas, other work to do.

from registry-core.

that's kind of where I am too ...

from registry-core.

Fairly urgent to establish whether it is feasible, and judged to be in the community's interest, for this request to be accommodated, though the actual fix could wait. Maybe a telecon this side of the break to verify?

from registry-core.

A possible quick (?) fix could be for a versioned entity to always redirect to the corresponding register item. i.e.

http://registry.it.csiro.au/test1/ba-glossary/aquitard:2 --303--> http://registry.it.csiro.au/test1/ba-glossary/_aquitard:2

I think HTTP 303 has the correct semantics.

Note that the current error message shown in the HTML view is misleading/wrong

"Sorry but the URI http://registry.it.csiro.au/test1/ba-glossary/aquitard was not found on this site."

from registry-core.

Result of phone call 2014-12-19T21:30:00+11:00 SC, JT, DR:

1. The RDF graph retrieved from http://registry.it.csiro.au/test1/ba-glossary/_aquitard:2 - i.e. the register-item - has all the content required - i.e. it includes the triples associated with the 2nd version of the description of the entity, along with the registry metadata that makes it clear that this is the 2nd version.
2. It is trivial to add a rule to the nginx proxy to redirect a URI like http://registry.it.csiro.au/test1/ba-glossary/aquitard:2 to this register item. So implementation is uncomplicated.
3. Conceptually this can be justified as
   "http://registry.it.csiro.au/test1/ba-glossary/aquitard:2" is shorthand for "the 2nd version of the graph describing the concept 'aquitard'"
   (which is also known as http://registry.it.csiro.au/test1/ba-glossary/_aquitard:2#graph )
4. Simon will get Fab (summer intern) to do the implementation, with some guidance from Dave if required.

from registry-core.

This is what we agreed.

Many thanks, Jeremy

from registry-core.

@dr-shorthair - did the proposed solution get implemented? Can we close this issue?

from registry-core.

I'm trying to test in some new deployments, at the same time as migrating to the new config.
But stopped by the dependency on core 0.1.1 which has not yet been released.

from registry-core.