- Each row in a delta release file represents either a new component or reference set member or a change to an existing component or reference set member since the identified previous release date.
- A delta release identifies difference between two versions of the same release package. A delta release added to the full release for the "identified previous release date" is identical to the full release for the new version.
- The "identified previous release date", on which a delta release is based, is usually the most recent previous release release. However, that may not always be the case. For example, where interim releases are made between two major releases there may be a combined delta release covering a period since a previous major releases.