So I'm just starting out with XPathScript. I have
quite a bit of XSLT experience, and I've noticed a
large difference in style between the two approaches.
Mty question is basically whether or not I'm
approaching the following problem in the right way for
XPathScript.
I have some XML which uses ID's to form a tree. IE:
<dataset>
<term>
<id>2</id>
<name>molecular_function</name>
<term2term>
<term1_id>1</term1_id>
</term2term>
</term>
<term>
<id>4</id>
<name>anti-toxin</name>
<term2term>
<term1_id>2</term1_id>
</term2term>
</term>
</dataset>
Note that term 4 has a value in term2term/term1_id of
2, which is a pointer to it's parent term. So we have
a tree like this:
term_2:molecular_function
term_4:anti-toxin
In XSLT, this recursion is handled with a recursive
apply-template. As far as I can see, there is no way
to do this in XPathScript, so the recursive function
is done in perl:
<%
my @nodes = findnodes('/dataset/term');
my @node_stack = (1);
sub node_walker {
my $parent_node = @node_stack->[scalar(@node_stack)
- 1];
foreach my $node(@nodes) {
if (findvalue('term2term[1]/term1_id', $node)
== $parent_node) {
push @node_stack, findvalue('id', $node);
print "\n";
foreach my $level(@node_stack) {
if ($level ne @node_stack->[0]) {
print ' ';
}
}
print apply_templates(findnodes('acc', $node));
print apply_templates(findnodes('name', $node));
&node_walker(findvalue('id', $node));
}
}
pop @node_stack;
}
&node_walker(1);
%>
Is this the correct XPathScript Approach? And more
generally, is there any way in XPathScript to
recursively apply_templates? (maybe recursively is
the wrong term. The example below should show what I
mean. IE:
$t->{'term'}{testcode} =
sub {
my $node = shift;
my $t = shift;
$t->{'pre'} = "<tr>";
# Here's the "recursive" call.
apply_templates(findnodes('name', $t));
$t->{'post'} = "</tr>";
return 1;
};
Thanks for any comments.
Brad Marshall
Berkeley Drosophila Genome Project
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