https://docs.unity3d.com/2017.3/Documentation/ScriptReference/AssetImporter.SourceAssetIdentifier-type.html
Unity - Scripting API: AssetImporter.SourceAssetIdentifier.type
scripting apiunitytype
https://docs.unity3d.com/es/2017.3/ScriptReference/AssetImporter.SourceAssetIdentifier-type.html
AssetImporter.SourceAssetIdentifier-type - Unity Scripting API
The type of the Asset.
typeunityscriptingapi
https://issuetracker.unity3d.com/issues/backport-assetimporter-updating-existing-animationclip-import-setting-results-in-a-new-internalid-and-lost-references-to-the-clip
Unity Issue Tracker - [Backport] [AssetImporter] Updating existing AnimationClip import setting...
issue trackerunitybackportupdatingexisting