Describe subOrganizationOf in publisher definition

Author: philipashlock

Diff for: v1.1/schema.md

@@ -77,7 +77,7 @@ title			        | Title               | Human-readable name of the asset.  Shoul
 description		        | Description         | Human-readable description (e.g., an abstract) with sufficient detail to enable a user to quickly understand whether the asset is of interest. 
 keyword			        | Tags                | Tags (or keywords) help users discover your dataset; please include terms that would be used by technical and non-technical users.             
 modified		        | Last Update         | Most recent date on which the dataset was changed, updated or modified.                                                                        
-publisher		        | Publisher           | The publishing entity.                                                                                                                         
+publisher		        | Publisher           | The publishing entity and optionally their parent organization(s)                                                                                                                     
 contactPoint	        | Contact Name and Email        | Contact person's name and email for the asset.                                                                                                           
 identifier		        | Unique Identifier   | A unique identifier for the dataset or API as maintained within an Agency catalog or database.                                                 
 accessLevel | Public Access Level      | The degree to which this dataset **could** be made publicly-available, *regardless of whether it has been made available*. Choices: public (Data asset is or could be made publicly available to all without restrictions), restricted public (Data asset is available under certain use restrictions), or non-public (Data asset is not available to members of the public)