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A literal placeholder is substituted as an untyped string, so comparing one against a typed value such as dct:created silently matches nothing: an untyped string and an xsd:dateTime are not comparable in SPARQL.

\n

Cast the placeholder explicitly wherever it is compared:

\n

filter(?date >= xsd:dateTime(?_startDate))

\n

The value passed by the caller must then be a full ISO 8601 date and time, for example 2026-03-01T00:00:00Z. A bare date such as 2026-03-01 makes the cast fail.

" } ], "https://w3id.org/kpxl/gen/terms/hasPositionString": [ { "@value": "01.06" } ] } ] } ]