[56] [CITE@en[RFC 2706 - ECML v1: Field Names for E-Commerce]], [TIME[2021-04-11T14:47:01.000Z]], [TIME[2021-04-12T02:28:12.679Z]] <https://tools.ietf.org/html/rfc2706>

[8] [CITE@en[RFC 3106 - ECML v1.1: Field Specifications for E-Commerce]]
([TIME[2014-11-30 23:24:40 +09:00]] 版)
<http://tools.ietf.org/html/rfc3106>

[57] [CITE[Using P3P for E-Commerce]], [TIME[2017-10-02T10:21:59.000Z]], [TIME[2021-04-22T09:53:52.341Z]] <https://www.w3.org/TR/1999/NOTE-P3P-for-ecommerce-19991129>

[1] [CITE@en[RFC 3505 - Electronic Commerce Modeling Language (ECML): Version 2 Requirements]], [TIME[2019-03-04T05:31:15.000Z]], [TIME[2021-04-24T09:48:54.291Z]] <https://tools.ietf.org/html/rfc3505>

[2] [CITE[Cover Pages: Electronic Commerce Modeling Language (ECML)]], [TIME[2008-01-22T03:19:09.000Z]], [TIME[2021-04-24T09:49:39.165Z]] <http://xml.coverpages.org/ecml.html>

[3] [CITE@en[rfc4112]], [TIME[2021-07-16T04:28:15.000Z]] <https://datatracker.ietf.org/doc/html/rfc4112>