This diagram illustrates one global document providing a single description for multiple instances of the same image in four separate web pages.
The four instances are:
The global document has text that reads:
One external file provides and controls the description for multiple docs.
With four dark red arrows the global document points to the same image in the four separate documents.
The image within the four pages is a statistical style diagram. It consists of a large black bell curve shape on a blue background with bright yellow star shapes surrounding it. The four web pages use dummy "Lorem ipsum" text.