def self.write_one(object, writer, singular = nil)
singular ||= 'tag'
writer.write_start(singular)
href = object.href
writer.write_attribute('href', href) unless href.nil?
writer.write_attribute('id', object.id) unless object.id.nil?
Writer.write_string(writer, 'comment', object.comment) unless object.comment.nil?
Writer.write_string(writer, 'description', object.description) unless object.description.nil?
Writer.write_string(writer, 'name', object.name) unless object.name.nil?
GroupWriter.write_one(object.group, writer, 'group') unless object.group.nil?
HostWriter.write_one(object.host, writer, 'host') unless object.host.nil?
TagWriter.write_one(object.parent, writer, 'parent') unless object.parent.nil?
TemplateWriter.write_one(object.template, writer, 'template') unless object.template.nil?
UserWriter.write_one(object.user, writer, 'user') unless object.user.nil?
VmWriter.write_one(object.vm, writer, 'vm') unless object.vm.nil?
writer.write_end
end