The Link Object is intended to characterize links, such as those on a webpage or in an e-mail message.
The object_reference field specifies a unique ID reference to an Object defined elsewhere. This construct allows for the re-use of the defined Properties of one Object within another, without the need to embed the full Object in the location from which it is being referenced. Thus, this ID reference is intended to resolve to the Properties of the Object that it points to.
The Custom_Properties construct is optional and enables the specification of a set of custom Object Properties that may not be defined in existing Properties schemas.
The type field specifies the type of URI that is being defined.
The Value field specifies the value of the URI.
The URL_Label field specifies the label of the link.