NAME

WebService::Validator::Feed::W3C - Interface to the W3C Feed Validation service

SYNOPSIS

use WebService::Validator::Feed::W3C;

my $feed_url = "http://www.example.com";
my $val = WebService::Validator::CSS::W3C->new;
my $ok = $val->validate(url => $feed_url);

if ($ok and !$val->is_valid) {
    print "Errors:\n";
    printf "  * %s\n", $_->{message}
      foreach $val->errors
}

DESCRIPTION

This module is an interface to the W3C Feed Validation online service http://validator.w3.org/feed/, based on its SOAP 1.2 support. It helps to find errors in RSS or Atom feeds.

The following methods are available:

my $val = WebService::Validator::Feed::W3C->new

my $val = WebService::Validator::Feed::W3C->new($ua)

my $val = WebService::Validator::Feed::W3C->new($ua, $url)

Creates a new WebService::Validator::Feed::W3C object. A custom LWP::UserAgent object can be supplied which is then used for HTTP communication with the W3C Feed Validation service. $url is the URL of the Feed Validator, http://validator.w3.org/feed/check.cgi by default.

my $success = $val->validate(%params)

Validate a feed takes %params as defined below. Either string or uri must be supplied. Returns a true value if the validation succeeded (regardless of whether the style sheet contains errors).

string => $feed_string

An atom or RSS feed, as a string. It is currently unlikely that validation will work if the string is not a legal UTF-8 string. If a string is specified, the uri parameter will be ignored. Note that GET will be used to pass the string to the Validator, it might not work with overly long strings.

uri => $feed_uri

The location of a style sheet or a RSS/Atom feed containing or referencing style sheets.

my $success = $val->success

Same as the return value of validate().

my $is_valid = $val->is_valid

Returns a true value if the last attempt to validate() succeeded and the validator reported no errors in the style sheet.

my @errors = $val->errors

Returns a list with information about the errors found for the style sheet. An error is a hash reference; the example in the synopsis would currently return something like

( {
  context    => 'p',
  property   => 'color',
  expression => { start => '', end => 'not-a-color' }
  errortype  => 'parse-error',
  message    => 'not-a-color is not a color value',
  line       => 0,
} )

my @warnings = $val->warnings

Returns a list with information about the warnings found for the style sheet. This is currently of limited use as it is broken, see http://www.w3.org/Bugs/Public/show_bug.cgi?id=771 for details.

@@example

my $ua = $val->user_agent

my $ua = $val->user_agent($new_ua)

The LWP::UserAgent object you supplied to the constructor or a custom object created at construction time you can manipulate.

# set timeout to 30 seconds
$val->user_agent->timeout(30);

You can also supply a new object to replace the old one.

my $uri = $val->validator_uri

my $uri = $val->validator_uri($validator_uri)

Gets or sets the URI of the validator. If you did not specify a custom URI, http://jigsaw.w3.org/css-validator/validator by default.

my $response = $val->response

The HTTP::Response object returned from the last request. This is useful to determine why validation might have failed.

if (!$val->validate(string => $feed_string)) {
  if (!$val->response->is_success) {
    print $val->response->message, "\n"
  }
}

my $uri = $val->request_uri

The URI object used for the last request.

my $som = $val->som

The SOAP::SOM object for the last successful deserialization, check the return value of validate() or success() before using the object.

NOTE

Please remember that the Feed Validation service is a shared resource, so do not abuse it: you should make your scripts sleep between requests.

AUTHOR

olivier Thereaux <ot@w3.org>

Based on the WebService::Validator::CSS::W3C module by Bjoern Hoehrmann <bjoern@hoehrmann.de> et.al.

This module is licensed under the same terms as Perl itself.