Before going further, let's establish some terminology:
- **Value Clip**: An individual \ref SdfLayer "layer" containing time varying data
- over some interval. **All metadata, relationships, and
- <a HREF="http://openusd.org/docs/USD-Glossary.html#USDGlossary-DefaultValue">default values</a>
+ over some interval. **All metadata, relationships, and [default values](http://openusd.org/docs/USD-Glossary.html#USDGlossary-DefaultValue)
present in a layer are ignored when the layer is consumed as a Value Clip.**
- **Clip Set**: A named set of value clips defined by a group of clip metadata.