def self.write_one(object, writer, singular = nil)
singular ||= 'group'
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, 'domain_entry_id', object.domain_entry_id) unless object.domain_entry_id.nil?
Writer.write_string(writer, 'name', object.name) unless object.name.nil?
Writer.write_string(writer, 'namespace', object.namespace) unless object.namespace.nil?
DomainWriter.write_one(object.domain, writer, 'domain') unless object.domain.nil?
PermissionWriter.write_many(object.permissions, writer, 'permission', 'permissions') unless object.permissions.nil?
RoleWriter.write_many(object.roles, writer, 'role', 'roles') unless object.roles.nil?
TagWriter.write_many(object.tags, writer, 'tag', 'tags') unless object.tags.nil?
writer.write_end
end