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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

0.3.0 - 2026-07-30

Added

  • Classified the RML-CC, RML-FNML and RML-STAR conformance test cases as passing or known-failing, each with an explanatory reason.
  • RMLLVFNMLTest, covering a logical-view field whose value is computed by an FnO function (toUpperCase), and enabled it in the GitLab CI pipeline.

Changed

  • Updated Algebraic Mapping Operators to 4.0.0, MappingLoom to 0.7.1 and idlab-functions-java to 1.5.0.
  • A source field's value is now read from MappingLoom's single expression instead of the separate reference and constant keys, which were fused as of MappingLoom 0.7.0. The expression is handed to an AMO ExpressionField as it is, whether it is a reference, a constant or a function computing the value; a function producing several values makes the field produce a record per value. This replaces the earlier mapping of a reference or constant onto AMO's now removed reference and constant fields.
  • ReferenceFunction reports itself as a bare reference (ExtendFunction.asReference()), so a field carrying it reads the attribute straight from the record and a path matching several values (a JSON array, an XML node list) still yields all of them.
  • RML-LV test case RMLLVTC0001c (a template-valued expression field) passes and is no longer listed as known-failing.
  • Synced the RML-IO, RML-STAR and RML-FNML test resources with their upstream RML test-case repositories and re-triaged the affected tests.
  • Enabled the passing spec test classes (RML-FNML, RML-STAR, RMLRegistry, WebSocket, FnO) in the GitLab CI pipeline.
  • Updated the README conformance table with the current test-case pass percentages.

Fixed

  • A function that fails at runtime (e.g. a substring index out of range) now yields an empty result instead of aborting the whole mapping, so no triple is generated for that value; a function that cannot be resolved still raises an error (fixes RML-FNML test case RMLFNMLTC0008-CSV).
  • Updated Algebraic Mapping Operators to 2.0.3
  • Updated MappingLoom to 0.6.8
  • Added GenerateBlankNode extend function, fixes RML-Core test case RMLTC0012e.

0.2.0 - 2026-05-27

Added

  • Upgraded Flink to v2.2.0
  • Implemented stdout sink using Flink 2.2's Sink API
  • Added a FlinkTargetOperator to handle the creation of sinks using a Factory pattern
  • Added an extra Flink operator step to extract the serialized RDF output from solution mappings before written the records into the sinks
  • Added CLI option -l --loom-file to take an AlgeMapLoom plan as input.
  • Added websocket support

Fixed

  • Updated RML test cases
  • Put dependency to FnOio in small case. See #1
  • Update dependency on MappingLoom to 0.6.6
  • Use base IRI given as program argument when generating relative IRIs

Changed

  • Updated Algemaploom-rs version to 0.6.5
  • (Re-)use Flink 2.2's mini-cluster for testing and reduce test start-up time

Refactored

  • Moved all CLI related parameters parsing and specification to a separate module
  • Updated pom.xml to directly pull dataio instead of pulling this through algebraic mapping operators

Removed

  • Old TargetSinkFunction which implements the deprecated legacy Flink's SinkFunction API
  • OperatorTests.java which doesn't test anything meaningful is removed
  • All existing implementations of a generic DataIO-based sink operators using legacy Flink's Source API

0.1.0 - 2025-10-08

Added

  • Initial source code