Framework has not yet an owner

[KatrinHeinze]

https://vscode.dev/github/sdmx-twg/wp-sdmx-dpm/blob/main/docs/models-relationships/02_data_definition/01_data_definition_overview.md#L392

The owner id is part of an extension of the DPM.

In addition, the release has only a 'date' and a 'status'. You could also add the attribute 'isCurrent'.
The 'code' attribute needs to be moved to the module version entity.

https://vscode.dev/github/sdmx-twg/wp-sdmx-dpm/blob/main/docs/models-relationships/02_data_definition/02_high_level_mapping_summary.md#L100-L101