SPUG: xml parsing

DeRykus, Charles E charles.e.derykus at boeing.com
Wed Oct 4 10:30:19 PDT 2006

>my $isbn=$$item{'book:isbn'};

>and returns empty but if I do it like this :

>my $isbn=$$item{book:isbn};

That should be:

My $isbn = ${$item{book:isbn}};

Here's some clarification from 'perldoc perldsc':

 The seemingly equivalent construct in Perl, $$aref[$i] first
 does the deref of $aref, making it take $aref as a reference
 to an array, and then dereference that, and finally tell you
 the i'th value of the array pointed to by $AoA. If you
 wanted the C notion, you'd have to write "${$AoA[$i]}" to
 force the $AoA[$i] to get evaluated first before the leading
 "$" dereferencer.


Charles DeRykus

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