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XPath::XMLParser(3)   User Contributed Perl Documentation  XPath::XMLParser(3)

NAME
       XML::XPath::XMLParser - The default XML parsing class that produces a
       node tree

SYNOPSIS
           my $parser = XML::XPath::XMLParser->new(
                       filename => $self->get_filename,
                       xml => $self->get_xml,
                       ioref => $self->get_ioref,
                       parser => $self->get_parser,
                   );
           my $root_node = $parser->parse;

DESCRIPTION
       This module generates a node tree for use as the context node for XPath
       processing.  It aims to be a quick parser, nothing fancy, and yet has
       to store more information than most parsers. To achieve this I've used
       array refs everywhere - no hashes.  I don't have any performance
       figures for the speedups achieved, so I make no appologies for anyone
       not used to using arrays instead of hashes. I think they make good
       sense here where we know the attributes of each type of node.

Node Structure
       All nodes have the same first 2 entries in the array: node_parent and
       node_pos. The type of the node is determined using the ref() function.
       The node_parent always contains an entry for the parent of the current
       node - except for the root node which has undef in there. And node_pos
       is the position of this node in the array that it is in (think: $node
       == $node->[node_parent]->[node_children]->[$node->[node_pos]] )

       Nodes are structured as follows:

   Root Node
       The root node is just an element node with no parent.

           [
             undef, # node_parent - check for undef to identify root node
             undef, # node_pos
             undef, # node_prefix
             [ ... ], # node_children (see below)
           ]

   Element Node
           [
             $parent, # node_parent
             <position in current array>, # node_pos
             'xxx', # node_prefix - namespace prefix on this element
             [ ... ], # node_children
             'yyy', # node_name - element tag name
             [ ... ], # node_attribs - attributes on this element
             [ ... ], # node_namespaces - namespaces currently in scope
           ]

   Attribute Node
           [
             $parent, # node_parent - the element node
             <position in current array>, # node_pos
             'xxx', # node_prefix - namespace prefix on this element
             'href', # node_key - attribute name
             'ftp://ftp.com/', # node_value - value in the node
           ]

   Namespace Nodes
       Each element has an associated set of namespace nodes that are
       currently in scope. Each namespace node stores a prefix and the
       expanded name (retrieved from the xmlns:prefix="..." attribute).

           [
             $parent,
             <pos>,
             'a', # node_prefix - the namespace as it was written as a prefix
             'http://my.namespace.com', # node_expanded - the expanded name.
           ]

   Text Nodes
           [
             $parent,
             <pos>,
             'This is some text' # node_text - the text in the node
           ]

   Comment Nodes
           [
             $parent,
             <pos>,
             'This is a comment' # node_comment
           ]

   Processing Instruction Nodes
           [
             $parent,
             <pos>,
             'target', # node_target
             'data', # node_data
           ]

Usage
       If you feel the need to use this module outside of XML::XPath (for
       example you might use this module directly so that you can cache parsed
       trees), you can follow the following API:

   new
       The new method takes either no parameters, or any of the following
       parameters:

               filename
               xml
               parser
               ioref

       This uses the familiar hash syntax, so an example might be:

           use XML::XPath::XMLParser;

           my $parser = XML::XPath::XMLParser->new(filename => 'example.xml');

       The parameters represent a filename, a string containing XML, an
       XML::Parser instance and an open filehandle ref respectively. You can
       also set or get all of these properties using the get_ and set_
       functions that have the same name as the property: e.g. get_filename,
       set_ioref, etc.

   parse
       The parse method generally takes no parameters, however you are free to
       pass either an open filehandle reference or an XML string if you so
       require.  The return value is a tree that XML::XPath can use. The parse
       method will die if there is an error in your XML, so be sure to use
       perl's exception handling mechanism (eval{};) if you want to avoid
       this.

   parsefile
       The parsefile method is identical to parse() except it expects a single
       parameter that is a string naming a file to open and parse. Again it
       returns a tree and also dies if there are XML errors.

NOTICES
       This file is distributed as part of the XML::XPath module, and is
       copyright 2000 Fastnet Software Ltd. Please see the documentation for
       the module as a whole for licencing information.

perl v5.12.1                      2001-03-14               XPath::XMLParser(3)
 

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