fix: 020_19/020_20 — deleted scope is the NGSI-LD Null, not an empty array

Ken Zangelinrequested to merge
fix/temporal-evolution-semantics into develop

TS 104-175 § 4.18's Scope ABNF states that the literal string "urn:ngsi-ld:null" shall be only used and only appear in case of deleted scopes; § 5.3.2.5's temporal deletion rule likewise substitutes the NGSI-LD Null. The two expectation fixtures instead encoded the deleted scope instance as an empty array ([]), which the grammar cannot produce.

  • vehicle-temporal-representation-property-020-19.jsonld: "value": [] → "value": "urn:ngsi-ld:null" (normalized)
  • vehicle-temporal-representation-property-020-20.jsonld: [[], ts] → ["urn:ngsi-ld:null", ts] (temporalValues pair)

Analysis recorded as testsuite-doubts.md #91 (closed).

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