Re^2: change setHandlers XML::Parser

[etlamar]

in reply to Re: change setHandlers XML::Parser
in thread change setHandlers XML::Parser

Thanks, Jenda, and Anonymous Monk, I am trying to parse through a huge kml file that contains longitude and latitude coordinates for census blocks and pull out only those long and lat coords that pertain to certain blocks within a subset of census tracts. I will have CDATA information to parse through to get the tract and block numbers, but right now I am just trying to test code on pulling out the long and lat coordinates that are denoted by a <coordinates> tag in the xml.

In other words, right now, I want to extract information only if the Start handler indicates a <coordinates> tag. That's why I am looking for a way to conditionally switch to a different handler.

Sorry for the long-winded answer.

Hope this helps.

XML::Twig looks interesting, but I was hoping to stick with a more SAX-like parser rather than DOM-like or pull-parser like.

Would you also suggest XML::Twig?

Thanks again.

[Anonymous Monk]

XML::Twig looks interesting, but I was hoping to stick with a more SAX-like parser rather than DOM-like or pull-parser like.

XML::Twig is super flexible, its SAX+DOM or SAX or DOM.

Rarely do you want to use the SAX feature alone, mostly its SAX+DOM (SAX+TWIG, only a little piece of DOM).

Re: XML::Twig n00b

$ perl
use XML::Twig ;
XML::Twig->new(
  twig_handlers => {
    'coordinates' => sub {
      print $_->xpath, "\n";
      print $_->trimmed_text, "\n\n";
    },
  },
)->xparse( "somefile.xml" );
__END__
/on/no/coordinates
ro

/on/ma/to/peia/coordinates
sham

/on/coordinates
bo

/on/coordinates[2]
<b>Asin</b> (I) - Biography


$ cat somefile.xml
<on>
<no><coordinates>ro</coordinates></no>
<ma><to><peia><coordinates>sham</coordinates></peia></to></ma>
<coordinates>bo</coordinates>
<coordinates><![CDATA[<b>Asin</b> (I) - Biography]]></coordinates>
</on>

[Jenda]

You can ask XML::Twig to give you just the tag(s) you are interested in (twig_root) and handle them by a custom subroutine. Or you can have a look at XML::Rules and basically do the same. Or if you were so inclined use XML::LibXML::SAX.

[etlamar]

Thanks very much to you both. I will try XML::Twig. I might come back with additional posts if I get stumped, but it sounds like that module will do the trick.

Thanks again

etlamar

[etlamar]

XML::Twig worked like a charm!

Thanks again very much!

etlamar