+ def to_xml_node
+ el1 = XML::Node.new 'segment'
+ el1['id'] = self.id.to_s
+ el1['from'] = self.node_a.to_s
+ el1['to'] = self.node_b.to_s
+ el1['user'] = self.user.display_name if self.user.data_public?
+ Segment.split_tags(el1, self.tags)
+ el1['visible'] = self.visible.to_s
+ el1['timestamp'] = self.timestamp.xmlschema
+ return el1
+ end