1 files changed, 67 insertions, 0 deletions
diff --git a/lib/Graph/GEXF/Role/XML.pm b/lib/Graph/GEXF/Role/XML.pm
new file mode 100644
index 0000000..c157d45
--- /dev/null
+++ b/lib/Graph/GEXF/Role/XML.pm
@@ -0,0 +1,67 @@
+package Graph::GEXF::Role::XML;
+
+use Moose::Role;
+
+use XML::Simple;
+
+has gexf_ns =>
+  (is => 'ro', isa => 'Str', default => 'http://www.gexf.net/1.1draft');
+
+has gexf_version => (is => 'ro', isa => 'Num', default => '1.1');
+
+sub to_xml {
+    my $self = shift;
+
+    my $graph = {
+        gexf => {
+            xmlns   => $self->gexf_ns,
+            version => $self->gexf_version,
+            meta    => {creator => ['Graph::GEXF']},
+            graph   => {
+                mode            => $self->graph_mode,
+                defaultedgetype => $self->edge_type,
+            }
+        }
+    };
+
+    foreach my $attr_id ($self->attributes_node_list) {
+        my $attribute = $self->get_node_attribute($attr_id);
+        $graph->{gexf}->{graph}->{attributes}->{class} = 'node';
+        push @{$graph->{gexf}->{graph}->{attributes}->{attribute}},
+          { id    => $attribute->{id},
+            type  => $attribute->{type},
+            title => $attribute->{title},
+          };
+    }
+
+    my $edges_id = 0;
+
+    foreach my $node_id ($self->all_nodes) {
+        my $node = $self->get_node($node_id);
+        my $node_desc = {
+            id => $node->id,
+            label => $node->label,
+        };
+
+        foreach my $attr_id ($node->attributes_node_list) {
+            my $attr = $node->get_node_attribute($attr_id);
+            push @{$node_desc->{attvalues}->{attvalue}}, {for => $attr->{id}, value => $attr->{value}};
+        }
+
+        push @{$graph->{gexf}->{graph}->{nodes}->{node}}, $node_desc;
+
+        foreach my $edge_id ($node->all_edges) {
+            my $edge = $node->get_edge($edge_id);
+            push @{$graph->{gexf}->{graph}->{edges}->{edge}},
+              { id     => $edges_id,
+                source => $edge->source,
+                target => $edge->target
+              };
+        }
+    }
+
+    my $xml_out = XMLout($graph, AttrIndent => 1, keepRoot => 1);
+    $xml_out;
+}
+
+1;