is this a structure of some kind?

[Humberto Varela]

sorry to ask such a simple question, but i can't find reference to this syntax in a 
couple of my Perl reference books (i think it's time i bought the Camel book)

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ALL_SESSIONS: foreach $session_dir (@ARGV) {
    @studies = `ls -1 "$session_dir" `;
    @session_path = split /\//, $session_dir ;
    $session = $session_path[$#session_path] ;
    print "\n Checking $session:" ;

    ALL_STUDIES: foreach $study (@studies) {
        chomp $study;
        $numfound = 0;
        @hits = (); # new list

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the items in CAPS: are some kind of structure, right?

i just haven't seen the CAPS: notation yet.

thanks.