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The 'Resource' interface (com.vaadin.server.Resource) defines a single method "public String getMIMEType();".
In other words, based solely on the interface 'Resource' one may retrieve a MIME Type related to some implementation.
Vaadin has a 'Resource Hierarchy' that adds a lot of supplemental functionality. These are implementation classes like ExternalResource, ThemeResource, ClassResource, FileResource, StreamResource.
Let's say someone wanted to know which of the following could be given as resources, as defined by the Resource interface (NOTE: the Resource interface is not the same thing as the Resource hierarchy):
URLs in hyperlinks
static images displayed in an image component
Which ones would seem the most qualified? (context: certain certification exams)