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Top Forums Shell Programming and Scripting Help in parsing XML output file in perl. Post 302745641 by jim mcnamara on Monday 17th of December 2012 05:17:20 PM
Old 12-17-2012
You are better off using XML::Parser - search.cpan.org
to parse xml.

It is somewhat complex, but it will handle correctly formed XML strings.
What if for some valid reason some "field" you expect to key off of is missing? grep may break. An xml parser won't.
 

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PARSER(1)						User Contributed Perl Documentation						 PARSER(1)

NAME
XML::DOM::Parser - An XML::Parser that builds XML::DOM document structures SYNOPSIS
use XML::DOM; my $parser = new XML::DOM::Parser; my $doc = $parser->parsefile ("file.xml"); DESCRIPTION
XML::DOM::Parser extends XML::Parser The XML::Parser module was written by Clark Cooper and is built on top of XML::Parser::Expat, which is a lower level interface to James Clark's expat library. XML::DOM::Parser parses XML strings or files and builds a data structure that conforms to the API of the Document Object Model as described at <http://www.w3.org/TR/REC-DOM-Level-1>. See the XML::Parser manpage for other additional properties of the XML::DOM::Parser class. Note that the 'Style' property should not be used (it is set internally.) The XML::Parser NoExpand option is more or less supported, in that it will generate EntityReference objects whenever an entity reference is encountered in character data. I'm not sure how useful this is. Any comments are welcome. As described in the synopsis, when you create an XML::DOM::Parser object, the parse and parsefile methods create an XML::DOM::Document object from the specified input. This Document object can then be examined, modified and written back out to a file or converted to a string. When using XML::DOM with XML::Parser version 2.19 and up, setting the XML::DOM::Parser option KeepCDATA to 1 will store CDATASections in CDATASection nodes, instead of converting them to Text nodes. Subsequent CDATASection nodes will be merged into one. Let me know if this is a problem. Using LWP to parse URLs The parsefile() method now also supports URLs, e.g. http://www.erols.com/enno/xsa.xml. It uses LWP to download the file and then calls parse() on the resulting string. By default it will use a LWP::UserAgent that is created as follows: use LWP::UserAgent; $LWP_USER_AGENT = LWP::UserAgent->new; $LWP_USER_AGENT->env_proxy; Note that env_proxy reads proxy settings from environment variables, which is what I need to do to get thru our firewall. If you want to use a different LWP::UserAgent, you can either set it globally with: XML::DOM::Parser::set_LWP_UserAgent ($my_agent); or, you can specify it for a specific XML::DOM::Parser by passing it to the constructor: my $parser = new XML::DOM::Parser (LWP_UserAgent => $my_agent); Currently, LWP is used when the filename (passed to parsefile) starts with one of the following URL schemes: http, https, ftp, wais, gopher, or file (followed by a colon.) If I missed one, please let me know. The LWP modules are part of libwww-perl which is available at CPAN. perl v5.8.0 2000-01-31 PARSER(1)
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