!!! Overview 
The [{$pagename}] of an event is the account or protected resource upon which the [XDAS Initiator] is attempting to perform the [XDAS Action] on, thereby provoking the generation of an event. 

The [{$pagename}] is described in terms of an account and an entity as well as an optional and unspecified Data object. 

The Data object is a set of name/value pairs describing class-specific attributes of the actor. The schema does not define the actual fields, as different classes will have a unique set of data attributes (if any). 

%%information
In the special case of a login event, the authenticated identity of the XDAS Initiator is not yet known until after the login attempt has succeeded. Therefore a failed login event should not give the identity of the XDAS Target account as the identity of the XDAS Initiator." Therefor [{$pagename}] is an optional field.
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!! More Information 
There might be more information for this subject on one of the following: 
[{ReferringPagesPlugin before='*' after='\n' }]