nl_tokens: works for activities and activityobjects
pl_tokens: function ( props ) { var inst , cls = this , key = props [ cls . keyAttr ] ; if ( <mask> && _ . has ( cls . cache , key ) ) { inst = cls . cache [ key ] ; // Check the updated flag inst . merge ( props ) ; } else { inst = new cls ( props ) ; if ( key ) { cls . cache [ key ] = inst ; } inst . on ( "change:" + cls . keyAttr , function ( model , key ) { var oldKey = model . previous ( cls . keyAttr ) ; if ( oldKey && _ . has ( cls . cache , oldKey ) ) { delete cls . cache [ oldKey ] ; } cls . cache [ key ] = inst ; } ) ; } return inst ; }