adding expanded guidance for systemOfRecords

Author: gbinal

Diff for: v1.1/schema.md

@@ -348,6 +348,15 @@ If there is a need to reflect that the dataset is continually updated, ISO 8601
 **Usage Notes** | This field should contain one of the following types of content: (1) a bounding coordinate box for the dataset represented in latitude / longitude pairs where the coordinates are specified in decimal degrees and in the order of: minimum longitude, minimum latitude, maximum longitude, maximum latitude; (2) a latitude / longitude pair (in decimal degrees) representing a point where the dataset is relevant; (3) a geographic feature expressed in [Geography Markup Language using the Simple Features Profile](http://www.ogcnetwork.net/gml-sf); or (4) a geographic feature from the [GeoNames database](http://www.geonames.org).
 **Example** |  `{"spatial":"Lincoln, Nebraska"}`
 
+{: .table .table-striped}
+**Field** | **systemOfRecords**
+----- | -----
+**Cardinality** | (0,1)
+**Required** | No
+**Accepted Values** | String (URL)
+**Usage Notes** | This field should a URL to the System of Records Notice (SORN) that relates to the dataset, specifically from FederalRegister.gov.   
+**Example** |  `{"https://www.federalregister.gov/articles/2002/04/08/02-7376/privacy-act-of-1974-publication-in-full-of-all-notices-of-systems-of-records-including-several-new#p-361"}`
+
 {: .table .table-striped}
 **Field <a class="permalink" href="#temporal">#</a>** | **<a name="temporal">temporal</a>**
 ----- | -----