---
title: DDI-Lifecycle v4.0 BETA 4 Review
description: DDI Alliance releases the final beta of DDI Lifecycle 4.0, seeking community feedback before public review and adoption. Explore new features and provide your input by April 15, 2025.
---

[News ](https://ddialliance.org/news)

# [DDI-Lifecycle v4.0 BETA 4 Review](https://ddialliance.org/news/ddi-lifecycle-v4.0-beta-4-review)

 Written by [lyle](https://ddialliance.org/news/author/lyle) | January 21, 2026

The Technical Committee is happy to announce the availability of the fourth beta version of DDI Lifecycle 4.0. This is intended to be the final beta release prior to a public review and adoption.

DDI Lifecycle 4.0 is managed using a Model First development approach. Content additions and changes are added to the model and the serialization formats are automatically generated. The metadata content of DDI 3.3 has been converted into the new 4.0 model.

Comments on this Beta 4.0 are requested by April 15th 2025.

We continue to look for feedback on the community's preference between the different OWL serializations and general comments about the XML and JSON. Users can provide questions and comments to the TC using GitHub issues with a free GitHub account at:  
[https://github.com/ddialliance/ddimodel/issues](https://github.com/ddialliance/ddimodel/issues)

The beta 4 package is available at:  
[https://github.com/ddialliance/ddimodel/releases](https://github.com/ddialliance/ddimodel/releases)

The documentation for DDI Lifecycle 4.0 is also auto-generated in real time from the model, and can be viewed at:  
[https://docs.ddialliance.org/DDI-Lifecycle/dev/model/](https://docs.ddialliance.org/DDI-Lifecycle/dev/model/)  
The latest DDI Lifecycle development outputs are auto-generated and can be viewed at:  
[https://docs.ddialliance.org/DDI-Lifecycle/dev/output/](https://docs.ddialliance.org/DDI-Lifecycle/dev/output/)

What's New and Changed

```
TypeOfVersionNumber should be a CodeValueTypeTypeOfUserID and TypeOfUserVersion should be CodeValueTypeAllow vocabulary instance URIs in code valueUse common reference naming conventiontypo in instrument documentation    Set variable to concept relation to 0..nAlign Concept relations with SKOSAllow name and label on GeneralInstruction, GenerationInstructionManagedMissingValuesRepresentation at RepresentedVariable level Update to newest COGS releaseinclude abstract types and use AllOf in json schemause new DateOnly and TimeOnly in csharp publisher, prefer AssumeUniversal when reading dates
```

 

The ddi-lifecycle-4.0-beta.4.zip package includes:

```
schema.xsd - XML SchemajsonSchema.json - JSON Schemadctap.csv - Dublin Core Tabular Application Profileddi4.xmi - OMG's UML XMI 2.5ddi4.owl - RDF OWL (closed with restrictions)ddi4.owl.ttl - RDF OWL (open)ddi4.shex - ShExddi4.shacl- SHACL
```

 

Other formats are also available but are not included in the official release.

Full Changelog: [v4.0-beta.3...v4.0-beta.4](https://github.com/ddialliance/ddimodel/compare/v4.0-beta.3...v4.0-beta.4)

Wendy Thomas, Chair,

on behalf of the DDI Alliance Technical Committee

[View full post](https://ddialliance.org/news/ddi-lifecycle-v4.0-beta-4-review)

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