Reading Characters from txt file

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xml::filter::sort::buffer

XML::Filter::Sort::Buffer(3pm)				User Contributed Perl Documentation			    XML::Filter::Sort::Buffer(3pm)

NAME

       XML::Filter::Sort::Buffer - Implementation class used by XML::Filter::Sort

DESCRIPTION

       The documentation is targetted at developers wishing to extend or replace this class.  For user documentation, see XML::Filter::Sort.

       For an overview of the classes and methods used for buffering, see XML::Filter::Sort::BufferMgr.

BUFFER LIFE CYCLE

       A XML::Filter::Sort::Buffer object is created by a XML::Filter::Sort::BufferMgr object using the "new()" method.

       The XML::Filter::Sort object will then propagate any SAX events it receives, to the buffer object until the end of the record is reached.
       As each element is added to the buffer, its contents are compared to the sort key paths and the sort key values are extracted.

       When the end of the record is reached, the "close()" method is called.  The return value from this method is the list of sort keys.

       The buffer manager will store the buffer until the end of the record sequence is reached.  Then it will retrieve each buffer in order of
       the sort key values and call the buffer's "to_sax()" method to send all buffered events to the downstream handler.

       Following the call to "to_sax()", the buffer is discarded.  No destructor method is used - everything is handled by Perl's garbage
       collector.

DATA STRUCTURES

       The buffer contains a 'tree' of SAX events.  The tree is simply an array of 'nodes'.  Text nodes are represented as scalars.  Other nodes
       are represented as arrayrefs.  The first element of a node array is a single character identifying the node type:

	 e - element
	 c - comment
	 p - processing instruction

       The second element is the node data (the hash from the original SAX event).  The child nodes of an element node are represented by the
       third element as an arrayref.

       For example, this XML:

	 <person age="27">
	   <lastname>smith</lastname>
	 </person>

       Would be buffered as this data structure:

	 [
	   [
	     'e',
	     {
	       'Name' => 'person'
	       'Prefix' => '',
	       'LocalName' => 'person',
	       'NamespaceURI' => '',
	       'Attributes' => {
		 '{}age' => {
		   'LocalName' => 'age',
		   'NamespaceURI' => '',
		   'Value' => '27',
		   'Prefix' => '',
		   'Name' => 'age'
		 }
	       },
	     },
	     [
	       "
  ",
	       [
		 'e',
		 {
		   'Name' => 'lastname'
		   'Prefix' => '',
		   'LocalName' => 'lastname',
		   'NamespaceURI' => '',
		   'Attributes' => {},
		 },
		 [
		   'smith'
		 ]
	       ],
	       "
  ",
	     ]
	   ]
	 ]

COPYRIGHT

       Copyright 2002 Grant McLean <grantm@cpan.org>

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

perl v5.12.4							    2005-04-20					    XML::Filter::Sort::Buffer(3pm)

Shell Programming and Scripting