NAME

Graph::Writer::XML - write out directed graph as XML

SYNOPSIS

    use Graph;
    use Graph::Writer::XML;
    
    $graph = Graph->new();
    # add edges and nodes to the graph
    
    $writer = Graph::Writer::XML->new();
    $writer->write_graph($graph, 'mygraph.xml');

DESCRIPTION

Graph::Writer::XML is a class for writing out a directed graph in a simple XML format. The graph must be an instance of the Graph class, which is actually a set of classes developed by Jarkko Hietaniemi.

The XML format is designed to support the Graph classes: it can be used to represent a single graph with a collection of nodes, and edges between those nodes. The graph, nodes, and edges can all have attributes specified, where an attribute is a (name,value) pair, with the value being scalar.

METHODS

new()

Constructor - generate a new writer instance.

    $writer = Graph::Writer::XML->new();

This doesn't take any arguments.

write_graph()

Write a specific graph to a named file:

    $writer->write_graph($graph, $file);

The $file argument can either be a filename, or a filehandle for a previously opened file.

KNOWN BUGS

Attribute values must be scalar. If they're not, well, you're on your own.

SEE ALSO

XML::Writer

The perl module used to actually write out the XML. It handles entities etc.

Graph

Jarkko Hietaniemi's modules for representing directed graphs, available from CPAN under modules/by-module/Graph/

Algorithms in Perl

The O'Reilly book which has a chapter on directed graphs, which is based around Jarkko's modules.

Graph::Writer

The base-class for Graph::Writer::XML

AUTHOR

Neil Bowers <neil@bowers.com>

COPYRIGHT

Copyright (c) 2001-2012, Neil Bowers. All rights reserved. Copyright (c) 2001, Canon Research Centre Europe. All rights reserved.

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