[7] [DFN[[[Memento framework]]]] は、[[資源]]の過去の状態を取得するための [[HTTP]] の機能群です。 * 仕様書 [REFS[ - [3] [CITE@en[RFC 7089 - HTTP Framework for Time-Based Access to Resource States -- Memento]] ([TIME[2014-10-05 16:32:34 +09:00]] 版) -- [4] [CITE@en[RFC 7089 - HTTP Framework for Time-Based Access to Resource States -- Memento]] ([TIME[2014-10-05 16:32:34 +09:00]] 版) -- [9] [CITE@en[RFC 7089 - HTTP Framework for Time-Based Access to Resource States -- Memento]] ([TIME[2014-10-05 16:32:34 +09:00]] 版) -- [2] [CITE@en[RFC 7089 - HTTP Framework for Time-Based Access to Resource States -- Memento]] ( ([TIME[2014-10-05 16:32:34 +09:00]] 版)) ]REFS] * プロトコル [13] 次の概念が定義されています。 [FIG(short list)[ - [[Original Resource]] - [[Memento]] - [[TimeGate]] - [[TimeMap]] ]FIG] [12] 次の[[HTTPヘッダー]]を定義または利用しています。 [FIG(short list)[ - [CODE(HTTP)@en[[[Memento-Datetime:]]]] - [CODE(HTTP)@en[[[Accept-Datetime:]]]] - [CODE(HTTP)@en[[[Vary:]]]] - [CODE(HTTP)@en[[[Link:]]]] ]FIG] [14] 次の[[リンク関係型]]を定義しています。 [FIG(short list)[ - [CODE(HTTP)@en[[[original]]]] - [CODE(HTTP)@en[[[memento]]]] - [CODE(HTTP)@en[[[timegate]]]] - [CODE(HTTP)@en[[[timemap]]]] ]FIG] * Memento (一般名詞) [5] [[Original Resource]] の [DFN[[[Memento]]]] は、 [[Original Resource]] の以前の状態をカプセル化した[[資源]]です [SRC[>>4]]。 [6] ある[[時刻]]に存在した [[Original Resource]] の [[Memento]] とは、 [[Original Resource]] のその時刻の状態をカプセル化した[[資源]]です [SRC[>>4]]。 [EG[ [8] [CODE(URI)[http://www.ietf.org/]] の [[Memento]] の例 [SRC[>>9]]: [FIG(list)[ - [CODE(URI)[http://web.archive.org/web/19970107171109/http://www.ietf.org/]] - [CODE(URI)[http://webarchive.nationalarchives.gov.uk/20080906200044/http://www.ietf.org/]] ]FIG] ]EG] [EG[ [10] [CODE(URI)[http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol]] の [[Memento]] の例 [SRC[>>9]]: [FIG(list)[ - [CODE(URI)[http://en.wikipedia.org/w/index.php?title=Hypertext_Transfer_Protocol&oldid=366806574]] ]FIG] ]EG] [EG[ [11] [CODE(URI)[http://www.w3.org/TR/webarch/]] の [[Memento]] の例 [SRC[>>9]]: [FIG(list)[ - [CODE(URI)[http://www.w3.org/TR/2004/PR-webarch-20041105/]] - [CODE(URI)[http://archive.is/20120527002537/http://www.w3.org/TR/webarch/]] ]FIG] ]EG] * 実装 [1] [CITE[Wayback Machine APIs | Internet Archive]] ( ([TIME[2014-08-27 01:38:37 +09:00]] 版)) [15] [CITE@en[RFC 7089 - HTTP Framework for Time-Based Access to Resource States -- Memento]] ( ([TIME[2014-10-05 16:32:34 +09:00]] 版)) [16] [[Internet Archive]] でアーカイブされている過去の [[Webサイト]]の各ページにも [[Memento]] の [CODE(HTTP)@en[[[Link:]]]] [[ヘッダー]]や [CODE(HTTP)@en[[[Memento-Datetime:]]]] [[ヘッダー]]が追加されているようです。 [17] [CITE@en[Memento update]] ( ([[Herbert Van de Sompel]]著, [TIME[2010-03-20 02:33:16 +09:00]])) [18] [CITE@en[Memento compliant DBpedia Archive with Triple Pattern Fragments support]] ( ([[Herbert Van de Sompel]]著, [TIME[2016-06-02 07:25:02 +09:00]])) [19] [CITE@en-US[Memento at the W3C | W3C Blog]] ([TIME[2016-09-01 12:11:32 +09:00]]) [FIG(quote)[ [FIGCAPTION[ [20] [CITE@en[Data on the Web Best Practices]] ([TIME[2017-01-30 21:58:55 +09:00]]) ]FIGCAPTION] > Use Memento '''['''RFC7089''']''', or components thereof, to express temporal versioning of a dataset and to access the version that was operational at a given datetime. The Memento protocol aligns closely with the approach for assigning URIs to versions that is used for W3C specifications, described below. ]FIG] [FIG(quote)[ [FIGCAPTION[ [21] [CITE@en[Web Annotation Data Model]] ([TIME[2017-02-24 02:14:26 +09:00]]) ]FIGCAPTION] > A Time State resource records the time at which the resource is appropriate for the Annotation, typically the time that the Annotation was created and/or a link to a persistent copy of the current version. The timestamp for the resource could be resolved via the Memento protocol, described in RFC 7089 '''['''rfc7089''']'''. ]FIG] [FIG(quote)[ [FIGCAPTION[ [22] [CITE@en[Selectors and States]] ([TIME[2017-02-24 02:14:26 +09:00]]) ]FIGCAPTION] > A Time State resource records the time at which the resource is when the intended selection occurs, typically the time that the resource was created and/or a link to a persistent copy of the current version. The timestamp for the resource could be resolved via the Memento protocol, described in RFC 7089 '''['''rfc7089''']'''. ]FIG] [23] [CITE@en[archive.is]] ([TIME[2015-05-07 02:49:11 +09:00]]) [24] [CITE[Web Science and Digital Libraries Research Group: 2013-07-15: Wayback Machine Upgrades Memento Support]] ([TIME[2019-02-10 08:39:53 +09:00]])