Policy Schema Overview in SharePoint Server 2010 (ECM)
Published: May 2010
Each information management policy must adhere to the Policy Schema.
The Policy root element contains the information that identifies, and applies to, the entire policy. It also contains the PolicyItems element, which contains one PolicyItem element for each policy feature included in the policy. Each PolicyItem element can include a CustomData element. Microsoft SharePoint Server 2010 does not read or use data in this element; instead, the element stores settings information that is specific to, and used by, the policy feature.
Following is a list of the elements in the Policy Schema: