# Change History

Date | Description
--- | ---

2019-02-15

This issue incorporates the following changes:

- Changed the length limit of a topic name to 255 characters.
- Delete some sections and add section API Usage Guidelines.

2018-09-30 | This issue incorporates the following changes: Added Version Querying.
2018-06-21 | This issue incorporates the following changes: Accepted in OTC-3.1
2018-06-05 | This issue incorporates the following changes: Updated the description for resource_type. (Currently, only smn_topic is supported).
2018-05-24 | This issue incorporates the following changes: Added the way to obtain a resource ID.

2018-04-30

This issue incorporates the following changes:

- Added Resource Tag Operations.
- Updated Returned Value.

2018-03-30 | This issue incorporates the following changes: Added the DMS subscription protocol.
2017-08-30 | This issue incorporates the following changes: Added description for obtaining a project ID.
2017-06-30 | This issue incorporates the following changes: Added Error Code.
2016-12-30 | This issue is the first official release.