|Domain = Thing|
|Range = URL|
|Cardinality = 0..1|
<img itemprop="image" src="http://farm1.static.flickr.com..." alt="Moon and Saturn"/>
When annotate an image as above you should have in mind that this image is a visual description of the entity you annotate. Typically, this entity is defined by the first ancestor HTML element that defines an itemscope attribute (usually this element defines also an itemtype attribute).