Images have properties built into their interface (e.g. Name), as well as dynamic properties accessed via a name or an ID. Dynamic properties are kept in a collection and can be queried, added, removed, by name or by ID. User properties can be isolated from other properties of similar name through a NameSpace.
This property is exposed as VARIANT holding the property found. Property could be a numerical value, an array, a string, an interface pointer, or any type supported by VARIANT.is not found, the output variant is empty.