Also, instead of source-filters, you could just put the psuedo-code into an arbitrary string, mangle the string into perl, and then eval that mangled string. (Obviously, this is example is oversimplified, but it gets the point accross) 
my $code = q{
  $x/html/head/title[0] = "Page Title";
  $x/html/body/h1[0] = "Some text here";
};
$code =~ s|/(\w+)|->{$1}|g;
eval $code; die $@ if $@;

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In reply to Re: User-Defined Syntax, XPath, Tied Hashes, and Autovivification by etcshadow
in thread User-Defined Syntax, XPath, Tied Hashes, and Autovivification by hackdaddy

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