Puppet users - Nov 2014 - scope of variable inside defined type

Hi,

I have written two defined type and trying to use some variables between 
them. 

----foo/manifest/init.pp ------------
define foo( $x=undef, $y=undef)
{

  if $x == undef {
   $xx = $defualt_x
  } else {
    $xx  = $x
  }

if $y == undef {
   $yy $defualt_y
  } else {
    $yy= $y
  }

 fooinstall {$xx:}
}


--------------foo/manifest/install.pp------------------- 
define foo::install (){
  if  $yy= "some text" 
  { 
     puppet code here
   }
  else {
     puppet code here 
  }
}


------ sites.pp ----
node 'hostnam-l.domain.com'
{
foo { "Aname" :
   $x => a,
   $y => b,
 }
}

Could you suggest how can I make this code work. I am not able to access 
$xx and $yy in defined type foo::install.

Thanks,
Rajgourav Jain

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