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Sveino / Inst4CIM-KG

Instance of CIM Knowledge Graph
Apache License 2.0
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bad relative URLs (need BASE or urn:uuid:) #87

Closed VladimirAlexiev closed 1 month ago

VladimirAlexiev commented 2 years ago

All XML files use node IDs like rdf:ID="_f1769b90-9aeb-11e5-91da-b8763fd99c5f". These are fragment URLs relative to the file location. Because xml:base is not set, they end up as random URLs depending on where the file is placed, eg:

<file:///d:/Onto/proj/Nordic44/Instances/CGMES_2_4/Nordic44_CGM_37a_EQ.xml#_393332ba-86c3-4257-b77b-006e41b78a71>
        rdf:type                   cim:OperationalLimitSet ;
        entsoe2:OperationalLimitSet.RateTemperature
                <file:///d:/Onto/proj/Nordic44/Instances/CGMES_2_4/Nordic44_CGM_37a_EQ.xml#_92e7d859-88ee-49ed-8a3e-9a7a1464c196> ;
        cim:IdentifiedObject.description
                "OperationalLimitSet 15 degree Celsius" ;
        cim:IdentifiedObject.name  "OLS_15dg_5101_5103_1" ;
        cim:OperationalLimitSet.Equipment
                <file:///d:/Onto/proj/Nordic44/Instances/CGMES_2_4/Nordic44_CGM_37a_EQ.xml#_f1769bc0-9aeb-11e5-91da-b8763fd99c5f> .
Sveino commented 2 years ago

We are planning to move away from rdf:ID and only use rdf:about. However, I also think that we need to address the issue of xml:base. My thinking is that we can use the URL from modelingAuthoritySet for xml:base.

griddigit-ci commented 2 years ago

It will be good to know if the xml:base is CIM namespace or the MAS URI as Svein says. Do we want to convey that a given rdf node is from the cim namespace or it is something local - the MAS Vlado, it will be good to know your thinking here.

Sveino commented 2 years ago

I think it make sense to think of xml:base as "who is speaking" so for power system model we should use MAS, but for the RDFS it should / could be the IEC standardisation speaking so this could be the CIM namespace.

VladimirAlexiev commented 2 years ago

@griddigit @Sveino what is MAS? Please give examples of the two cases you describe, then I can advise.

VladimirAlexiev commented 2 months ago
VladimirAlexiev commented 1 month ago

See https://github.com/Sveino/Inst4CIM-KG/tree/develop/rdf-improved/test/trig for examples.