deploy JSON-LD contexts on a permanent network location

[VladimirAlexiev]

• Currently JSON-LD files use network contexts on rawgit2.com, which serves them with appropriate content-type: application/ld+json:
  • https://rawgit2.com/Sveino/Inst4CIM-KG/develop/rdfs-improved/CIM-ontology-context.jsonld for ontologies
  • https://rawgit2.com/Sveino/Inst4CIM-KG/develop/rdf-improved/cim-context-old.jsonld for instance files using old namespaces
  • https://rawgit2.com/Sveino/Inst4CIM-KG/develop/rdf-improved/cim-context-new.jsonld for instance files using new namespaces
• We cannot use github directly because it doesn't serve the appropriate content type (first is the original URL, second is the redirected URL):

curl -LI https://github.com/Sveino/Inst4CIM-KG/raw/refs/heads/develop/rdfs-improved/CIM-ontology-context.jsonld
Content-Type: text/html; charset=utf-8
Location: https://raw.githubusercontent.com/Sveino/Inst4CIM-KG/refs/heads/develop/rdfs-improved/CIM-ontology-context.jsonld
Content-Type: text/plain; charset=utf-8

• output ontologies as JSONLD #99 initially was done with a local contextfile://CIM-ontology-context.jsonld . The output included the same relative URL, which is not good.

  "@context": "file://CIM-ontology-context.jsonld",

rawgit2 is very reliable, and I've been using it for my publications https://rawgit2.com/VladimirAlexiev/my/master/index.html for 10 years.
But it's not a permanent CIMug/ENTSOE location, so we need to look for a better location.
Just like rawgit, it should be updated automatically when the github file changes.

For the ontologies, the context is small so we we could embed it.
But for instance data we definitely need a network context, so we better find a solution.

[VladimirAlexiev]

@Sveino wrote:

• The www.model4powersystem.eu domain intends at referencing the power system models, or Individual Grid Model (IGM) and Common Grid Model (CGM) as stated in the network code.
• The www.cim4.eu domain is though to refer structure metadata that describe classes, attributes and association and organisation and relationship within a dataset to form an information model or ontology.
• The www.referencedata.eu will be used for referencing instance data that is common for one or more business process in a semantic web structure and format (e.g., referencing the electrical market bidding zone).

[griddigit-ci]

We need to describe - How do we solve the need to access the context when you read instance data in an environment that does not have internet connection?

[VladimirAlexiev]

• Many JSONLD tools support caching
• Maybe some support "URL redirection" through a registry, kind of like XML files can specify the location of a schema to be different from its namespace.

GraphDB has a whitelist of network contexts (URL patterns) because it was judged a security risk to allow fetching any URL from a JSONLD file.
But I'm not sure it has a "URL redirection" registry. If this issue confirms that's needed, I'll ask for such feature.