1. A concise explanation of the problem you're experiencing.
Trying to get a datasource by id, similar to how entities can be gotten by id.
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
I know var dss = viewer.dataSources; gets all of the data sources, but I just want to get one of them. I have the ID of one of the entities created by the czml import, but how do I get this entity? I do not believe it is listed under viewer.entities.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
Trying to get an entity created by a data source by only having the id of one of the entities created by the czml import.
4. The Cesium version you're using, your operating system and browser.
Cesium 1.47, Centos, Firefox