Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

comment on

( [id://3333] : superdoc . print w/replies, xml ) Need Help??


XML::PYX, based on XML::Parser is the Perl implementation. It comes with 3 tools: pyx (non-validating) and pyxv (validating) output the Pyx version of the document and pyxw writes an XML version of a Pyx flow. See - Pyxie for a description of Pyxie

Why use PYX?

  • you don't want to know to much about XML
  • you are used to, and you like line-oriented tools
  • you are just extracting some data from the XML document
  • you are doing simple XML transformation

Why NOT use XML::PYX

  • you want to do complex transformations
  • you are more at ease with tree-processing
  • you don't like writing all those regexps with \(
  • you need some information from the XML documents that Pyx does not provide (comments, entity declarations...)

Related Module

XML::TiePYX is easier to use on a Windows system

Personal notes

Pyx is really cool to extract information from an XML file, or to perform simple transformations on simple XML files. The module is mature (it is quite simple so there shouldn't be too many bugs in it). I never actually use the module, only pyx, which I pipe to a perl -n or perl -p script.


Print all the elements used in an XML document, with the number of occurences.

pyx file.xml | perl -n -e '$nb{$1}++ if( m/\A\((.*)\n/); \
                            END { map { print "$_ used $nb{$_} time(s)\n";} sort keys %nb;}'

Warn in case of duplicate ID:

pyx file.xml | perl -n -e '($id)=( m/^Aid (.*)\n/) or next; print "duplicate id: $id\n" if($id{$id});  $id{$id}=1;'

Change a tag name (class to color):

pyx wine.xml | perl -p -e 's/^([()])class/$1color/' | pyxw

In reply to XML::PYX by mirod

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.