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.\" ========================================================================
.\"
.IX Title "Node 3pm"
.TH Node 3pm "2022-11-19" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
XML::Node \- Node\-based XML parsing: a simplified interface to XML::Parser
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use XML::Node;
\&
\& $xml_node = new XML::Node;
\& $xml_node\->register( $nodetype, $callback_type => \e&callback_function );
\& $xml_node\->register( $nodetype, $callback_type => \e$variable );
\&    
\& open(FOO, \*(Aqxmlgenerator |\*(Aq);
\& $p3\->parse(*FOO);
\& close(FOO);
\&
\& $xml_node\->parsefile( $xml_filename );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
If you are only interested in processing certain nodes in an \s-1XML\s0 file, this 
module can help you simplify your Perl scripts significantly.
.PP
The XML::Node module allows you to register callback functions or variables for 
any  \s-1XML\s0 node. If you register a call back function, it will be called when
the nodes of the type you specified are encountered. If you register a variable, 
the content of a \s-1XML\s0 node will be appended to that variable automatically.
.PP
Subroutine register accepts both absolute and relative node registrations.
.PP
Here is an example of absolute path registration:
.PP
.Vb 1
\& 1. register(">TestCase>Name", "start" => \e&handle_TestCase_Name_start);
.Ve
.PP
Here are examples of single node name registration:
.PP
.Vb 3
\& 2. register( "Name", "start" => \e&handle_Name_start);
\& 3. register( "Name", "end"   => \e&handle_Name_end);
\& 4. register( "Name", "char"  => \e&handle_Name_char);
.Ve
.PP
Here is an example of attribute registration:
.PP
.Vb 1
\& 5. register(">TestCase:Author", "attr" => \e$testcase_author);
.Ve
.PP
Absolute path trigger condition is recommended because a \*(L"Name\*(R" tag could appear in different
places and stands for different names.
.PP
Example:
.PP
.Vb 6
\&  1  <Testcase>
\&  2     <Name>Something</Name>
\&  3     <Oracle>
\&  4         <Name>Something</Name>
\&  5     </Oracle>
\&  6  </Testcase>
.Ve
.PP
Statement 1 causes &handle_TestCase_Name_start to be called when parsing Line 2. Statements 2,3,4 cause the three handler subroutines to be called when parsing both Line 2 and Line 4.
.PP
This module uses XML::Parser.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
Examples \*(L"test.pl\*(R" and \*(L"parse_orders.pl\*(R" come with this perl module.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
XML::Parser
.SH "NOTE"
.IX Header "NOTE"
When you register a variable, XML::Node appends strings found to that variable. So please be sure to clear that variable before it is used again.
.SH "AUTHORS"
.IX Header "AUTHORS"
Chang Liu <liu@ics.uci.edu>
.SH "LAST MODIFIED"
.IX Header "LAST MODIFIED"
\&\f(CW$Date:\fR 2001/12/10 11:38:28 $