xsl:key match all values

Hello,

How do you setup a key that simply matches all child elements from the
match?  Given:

<AAA> 
     <BBB t="1"> 
          <CCC  s = "1"/> 
          <CCC  s = "2"/> 
          <CCC  s = "3"/> 
          <CCC  s = "4"/> 
          <CCC  s = "5"/> 
          <CCC  s = "6"/> 
     </BBB> 
     <CCC> 
          <BBB  r = "a"/> 
          <BBB  r = "b"/> 
          <BBB  r = "c"/> 
     </CCC> 
     <BBB/> 
     <BBB/> 
</AAA> 


I just want to return all child elements of BBB t='1'.
So results would be:

          <CCC  s = "1"/> 
          <CCC  s = "2"/> 
          <CCC  s = "3"/> 
          <CCC  s = "4"/> 
          <CCC  s = "5"/> 
          <CCC  s = "6"/> 


Karl