As with recent milestones, M17 does not contain any in-place schema changes (no M16 schema resources were changed in-place). Refer here for [full list of OSDU changes "OSDU schemas"](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/ChangeReport.md#snapshot-2023-01-27-towards-m17) and [full changes "OSDU reference-values"](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/ReferenceValues/ChangeLogs/M17/README.md)
***Extensions to work-product-component entities**
**_All_** work-product-component group-type entities (see the [list of work-product-component entities impacted](/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/README.md#work-product-component-changes)) include AbstractWPCGroupType, which has been subject to the following extensions:
* New `DDMSDatasets[]` property to record 'optimized content' in addition to existing 'original content' (Datasets[]) and derived artefacts (`Artefacts[]`). Details are explained in the [Schema Usage Guide](/osdu/data/data-definitions/-/blob/v0.20.0/Guides/Chapters/02-GroupType.md#241-content).
* New `NameAliases[]` referring to AbstractAliasNames, adding the same support for alias names as for all master-data.
* Including the extended version of [AbstractTechnicalAssurance](/osdu/data/data-definitions/-/blob/v0.20.0/E-R/abstract/AbstractTechnicalAssurance.1.1.0.md).
***Reference Value Changes/Updates**
* New reference value lists, [overview here](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/ReferenceValues/ChangeLogs/M17/README.md#new-reference-value-lists).
* Value lists new under [PPDM Governance](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/ReferenceValues/ChangeLogs/M17/README.md#new-ppdm-governance).
* Well Planning lists with [changed (→ OPEN) governance](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/ReferenceValues/ChangeLogs/M17/README.md#governance-change).
* TechnicalAssurance [WorkflowPersonaType](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/WorkflowPersonaType.1.0.0.md) and [WorkflowUsageType](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/WorkflowUsageType.1.0.0.md)
***Seismic Domain Changes**<br>Support for field data was added:
* New [dataset--FileCollection.SEGD:1.0.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/dataset/FileCollection.SEGD.1.0.0.md), a sibling to [dataset--FileCollection.SEGY:1.0.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/work-product-component/SeismicTraceData.1.4.0.md) for the seismic field data content.
* New [work-product-component--SeismicAcquisitionDocuments:1.0.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/work-product-component/SeismicAcquisitionDocuments.1.0.0.md) collecting all acquisition related documents and datasets with the
* new [work-product-component--SeismicFieldTraceData:1.0.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/work-product-component/SeismicFieldTraceData.1.0.0.md) representing the business object for the field data. The type is modelled similar to the SeismicTraceData, however as a separate type to avoid mixing with the processed data.
***Well Domain Changes**
* Extension to [master-data--WellboreOpening:1.1.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/WellboreOpening.1.0.0.md) to refer to an opening type.
* Extensions to [master-data--HoleSection:1.2.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/master-data/HoleSection.1.2.0.md).
* Extensions to [master-data--SurveyProgram:1.1.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/E-R/master-data/SurveyProgram.1.1.0.md) allowing survey sections to refer to different Wellbores and WellboreTrajectories.
* Extensions to [work-product-component--TubularAssembly:1.1.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/TubularAssembly.1.0.0.md) with an explicit VerticalMeasurement structure as in other wellbore related entities.
* Extensions to [work-product-component--WellboreTrajectory:1.2.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/WellboreTrajectory.1.1.0.md) adding summary information.
* Extensions to [work-product-component--WellLog:1.3.0](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.20.0/Guides/MigrationGuides/M17/WellLog.1.2.0.md) to disclose mud/fluid and conveyance method during logging.