nl_tokens: Copies a set of named properties fom the source object to the destination object .
pl_tokens: function ( dest , source , names , usePrototypeKeys ) { if ( typeof <mask> == 'string' ) { names = names . split ( / [,;\s] / ) ; } var n , nLen = names ? names . length : 0 , name ; for ( n = 0 ; n < nLen ; n ++ ) { name = names [ n ] ; if ( usePrototypeKeys || source . hasOwnProperty ( name ) ) { dest [ name ] = source [ name ] ; } } return dest ; }