|tail_uuid|string|The origin or actor in the description or action (may be null).|
|link_class|string|Type of link|
|name|string|Primary value of the link.|
-|properties|hash|Additional information, expressed as a key→value hash. Key: string. Value: string, number, array, or hash.|
+|properties|hash|Additional information, expressed as a key→value hash. Key: string. Value: string, number, array, or hash. May be used in queries using "subproperty filters":{{site.baseurl}}/api/methods.html#subpropertyfilters|
h2. Link classes