NAME

       XML::LibXML::Error - Structured Errors

SYNOPSIS

         eval { ... };
                 if (ref($@)) {
                   # handle a structured error (XML::LibXML::Error object)
                 } elsif ($@) {
                   # error, but not an XML::LibXML::Error object
                 } else {
                   # no error
                 }

         $XML::LibXML::Error::WARNINGS=1;
         $message = $@->as_string();
         print $@->dump();
         $error_domain = $@->domain();
         $error_code = $@->code();
         $error_message = $@->message();
         $error_level = $@->level();
         $filename = $@->file();
         $line = $@->line();
         $nodename = $@->nodename();
         $error_str1 = $@->str1();
         $error_str2 = $@->str2();
         $error_str3 = $@->str3();
         $error_num1 = $@->num1();
         $error_num2 = $@->num2();
         $string = $@->context();
         $offset = $@->column();
         $previous_error = $@->_prev();

DESCRIPTION

       The XML::LibXML::Error class is a tiny frontend to libxml2's structured error support. If XML::LibXML is
       compiled with structured error support, all errors reported by libxml2 are transformed to
       XML::LibXML::Error objects. These objects automatically serialize to the corresponding error messages
       when printed or used in a string operation, but as objects, can also be used to get a detailed and
       structured information about the error that occurred.

       Unlike most other XML::LibXML objects, XML::LibXML::Error doesn't wrap an underlying libxml2 structure
       directly, but rather transforms it to a blessed Perl hash reference containing the individual fields of
       the structured error information as hash key-value pairs. Individual items (fields) of a structured error
       can either be obtained directly as $@->{field}, or using autoloaded methods such as $@->field() (where
       field is the field name). XML::LibXML::Error objects have the following fields: domain, code, level,
       file, line, nodename, message, str1, str2, str3, num1, num2, and _prev (some of them may be undefined).

       $XML::LibXML::Error::WARNINGS
             $XML::LibXML::Error::WARNINGS=1;

           Traditionally,  XML::LibXML  was  suppressing  parser  warnings  by setting libxml2's global variable
           xmlGetWarningsDefaultValue to 0. Since 1.70 we do not change libxml2's global variables anymore;  for
           backward  compatibility,  XML::LibXML  suppresses  warnings.  This variable can be set to 1 to enable
           reporting of these warnings via Perl "warn" and to 2 to report hem via "die".

       as_string
             $message = $@->as_string();

           This function serializes an XML::LibXML::Error object to a string containing the full  error  message
           close  to  the message produced by libxml2 default error handlers and tools like xmllint. This method
           is also used to overload "" operator on XML::LibXML::Error, so it is  automatically  called  whenever
           XML::LibXML::Error object is treated as a string (e.g. in print $@).

       dump
             print $@->dump();

           This  function  serializes  an  XML::LibXML::Error  to  a  string  displaying all fields of the error
           structure individually on separate lines of the form 'name' => 'value'.

       domain
             $error_domain = $@->domain();

           Returns string containing information about what part of the library raised the error. Can be one of:
           "parser", "tree", "namespace", "validity", "HTML parser", "memory", "output", "I/O",  "ftp",  "http",
           "XInclude",  "XPath", "xpointer", "regexp", "Schemas datatype", "Schemas parser", "Schemas validity",
           "Relax-NG parser", "Relax-NG validity", "Catalog", "C14N", "XSLT", "validity".

       code
             $error_code = $@->code();

           Returns the actual libxml2 error code. The XML::LibXML::ErrNo module defines constants for individual
           error codes. Currently libxml2 uses over 480 different error codes.

       message
             $error_message = $@->message();

           Returns a human-readable informative error message.

       level
             $error_level = $@->level();

           Returns an integer value describing how consequent is  the  error.   XML::LibXML::Error  defines  the
           following constants:

           •   XML_ERR_NONE = 0

           •   XML_ERR_WARNING = 1 : A simple warning.

           •   XML_ERR_ERROR = 2 : A recoverable error.

           •   XML_ERR_FATAL = 3 : A fatal error.

       file
             $filename = $@->file();

           Returns the filename of the file being processed while the error occurred.

       line
             $line = $@->line();

           The line number, if available.

       nodename
             $nodename = $@->nodename();

           Name  of  the node where error occurred, if available. When this field is non-empty, libxml2 actually
           returned a physical pointer to the specified node.  Due to  memory  management  issues,  it  is  very
           difficult to implement a way to expose the pointer to the Perl level as a XML::LibXML::Node. For this
           reason, XML::LibXML::Error currently only exposes the name the node.

       str1
             $error_str1 = $@->str1();

           Error specific. Extra string information.

       str2
             $error_str2 = $@->str2();

           Error specific. Extra string information.

       str3
             $error_str3 = $@->str3();

           Error specific. Extra string information.

       num1
             $error_num1 = $@->num1();

           Error specific. Extra numeric information.

       num2
             $error_num2 = $@->num2();

           In recent libxml2 versions, this value contains a column number of the error or 0 if N/A.

       context
             $string = $@->context();

           For parsing errors, this field contains about 80 characters of the XML near the place where the error
           occurred.  The  field  "$@->column()"  contains  the  corresponding  offset.  Where N/A, the field is
           undefined.

       column
             $offset = $@->column();

           See "$@->column()" above.

       _prev
             $previous_error = $@->_prev();

           This field can possibly hold a reference to another XML::LibXML::Error object representing  an  error
           which occurred just before this error.

AUTHORS

       Matt Sergeant, Christian Glahn, Petr Pajas

VERSION

       2.0122

COPYRIGHT

       2001-2007, AxKit.com Ltd.

       2002-2006, Christian Glahn.

       2006-2009, Petr Pajas.

LICENSE

       This  program  is  free  software;  you can redistribute it and/or modify it under the same terms as Perl
       itself.

perl v5.22.1                                       2017-11-23                            XML::LibXML::Error(3pm)