Cached Source Info
Cache identity for a tile / feature source — the key under which its bytes live in the cache plus the path of the underlying earth.worldwind.util.ContentManager. Layer extensions (TiledImageLayer.cachedSourceInfo, TiledElevationCoverage.cachedSourceInfo, etc.) walk the layer's source chain and return this when the layer is wired through a cache. null means "no cache wired" — the layer is network-only.