v4.10.0-RC1
Pre-release
Pre-release
To fix any issues due to migration, please go to the migration guide. Labels 
Release notes
CGMES
- CGMES export: avoid duplicated base voltages (#2162)
- Allow setting terminal P for shunt compensators in CGMES import (#2189)
- CGMES import: reset slack terminal only if previous was disconnected (#2187)
- Read base URI if present during CGMES triplestore import and apply to all files (#2197)
- Allow boundaries to be assembled with other network data in the same instance file (#2216)
- CGMES: terminal sequenceNumber can be optional (#2245)
- CGMES export: ensure all exported identifiers are valid (#2151)
Configuration
- Improve import/export parameters description (#2255)
Conversion
- Importer and exporter refactoring (#2217)
IIDM
- Limit getters return optionals (#2169)
- Allow setting terminal P for shunt compensators (#2189)
- Move parameters to commons (#2199)
- Move extensions from sld to core (#2198)
- Able to choose encoding for network xml export (#1591)
- Use intermediary objects to copy limits for modification AttachNewLineOnLine and AttachVoltageLevelOnLine (#2207)
- Fix extensions namespaces (#2231)
- Proposition for network modification builder (#2218)
- Network modification: create feeder bay (#2214, #2254, #2256 & #2259)
- Add convenient methods to retrieve bus-breaker buses from bus-branch bus ID (#2239)
- Clean NetworkModification interface and implementations of complicated override methods (#2252)
- Transform line on line into voltage level on line (#2249)
- [Network modification] Add method to get orders by connectable (#2264)
- [Network modification] Create Hypothesis for creation of branch feeders (#2257)
- [Network modification] Add logging for CreateLineOnLine and ConnectVoltageLevelOnLine (#2266)
Math
- Improve dense matrix multiplication and addition performance (#2236)
MatPower
- Apparent power limits are now imported on both sides of branches, instead of only side 1 (#2221)
PowerFactory
- Select nodeRef in concordance with the busIndexIn parameter (#2098)
- Transformers (#2100)
- Review conversion of nodes and switches. (#2166)
- Common Impedance (ElmZpu) (#2181)
- Shunt converter (#2185)
- Reorganize code. (#2188)
- Parallel lines defined using Tower (ElmTow) (#2195)
- strengthen DgsParser (#2196)
- Voltage levels and substations creation (#2202)
- Extend containersMapping changes to importers (#2210)
- Hvdc links (#2222)
- fix updates of voltages (#2248)
- Capability curve and minor changes (#2224)
Security analysis
- Add remedial actions for security analysis (#2095)
- Line connection action (#2243)
- Fix NPE in BranchObservability XML serialization (#2235)
- Extension adder: change return type of add method (#2246)
- Rename topology network modifications (#2238)
- Fix lineConnectionAction deserializer (#2251)
- PreContingencyResult: correct method name (#2253)
- Phase tap changer tap position action (#2242)
Sensitivity analysis
- Sensitivity analysis: add contingency status in the results (#2186)
- Increase sensitivity function and variable types to support ThreeWindingsTransformer (#2260)
- Rework sensitivity analysis results (#2263)
Short circuit
Quality