xpath sequence methods and subscripts

1. anyone got an example of how to return the results of a sequence method 
such as tokenize ?

    <assign var="?alltokens"  expr="tokenize('in the beginning') />

2. or how to return the second "token" - some kind of subscript on data??

    <assign var="?secondtoken"  expr="data(tokenize('in the beginning'),2) 
/>