nl_tokens: Create a new Relation .
pl_tokens: function ( model , relation , options ) { var type = ! _ . isString ( relation . type ) ? relation . type : Backbone [ relation . type ] || this . getObjectByName ( relation . type ) ; if ( type && <mask> . prototype instanceof Backbone . Relation ) { new type ( model , relation , options ) ; // Also pushes the new Relation into `model._relations` } else { Backbone . Relational . showWarnings && typeof console !== 'undefined' && console . warn ( 'Relation=%o; missing or invalid relation type!' , relation ) ; } }