# RDF Site Summary 1.0 Modules: Syndication

## Authors

The members of the RSS-DEV Working Group:-

Gabe Beged-Dov, JFinity Systems LLC
Dan Brickley, ILRT
Rael Dornfest, O'Reilly & Associates
Ian Davis, Calaba, Ltd.
Leigh Dodds, xmlhack
Jonathan Eisenzopf, Whirlwind Interactive
David Galbraith, Moreover.com
R.V. Guha, guha.com
Ken MacLeod, (Independent)
Eric Miller, Online Computer Library Center, Inc.
Aaron Swartz, The Info Network
Eric van der Vlist, Dyomedea

## Version

Latest Version: http://purl.org/rss/1.0/modules/syndication/

1.4.1 2000-12-20 (editor: SBP - cleaned up markup)
1.4 2000-12-09

## Status

Release

## Rights

Copyright © 2000 by the Authors.

Permission to use, copy, modify and distribute the RDF Site Summary 1.0 Specification and its accompanying documentation for any purpose and without fee is hereby granted in perpetuity, provided that the above copyright notice and this paragraph appear in all copies. The copyright holders make no representation about the suitability of the specification for any purpose. It is provided "as is" without expressed or implied warranty.

This copyright applies to the RDF Site Summary 1.0 Specification and accompanying documentation and does not extend to the RSS format itself.

## Description

Provides syndication hints to aggregators and others picking up this RDF Site Summary (RSS) feed regarding how often it is updated. For example, if you updated your file twice an hour, updatePeriod would be "hourly" and updateFrequency would be "2". The syndication module borrows from Ian Davis's Open Content Syndication (OCS) directory format. It supercedes the RSS 0.91 skipDay and skipHour elements.

updatePeriod
Describes the period over which the channel format is updated. Acceptable values are: hourly, daily, weekly, monthly, yearly. If omitted, daily is assumed.

updateFrequency
Used to describe the frequency of updates in relation to the update period. A positive integer indicates how many times in that period the channel is updated. For example, an updatePeriod of daily, and an updateFrequency of 2 indicates the channel format is updated twice daily. If omitted a value of 1 is assumed.

updateBase
Defines a base date to be used in concert with updatePeriod and updateFrequency to calculate the publishing schedule. The date format takes the form: yyyy-mm-ddThh:mm

## Namespace Declarations

- xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"

## Model

<channel> Elements:

- <sy:updatePeriod> ( 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly' )
- <sy:updateFrequency> ( a positive integer )
- <sy:updateBase> ( #PCDATA ) [W3CDTF]

## Example

    <?xml version="1.0" encoding="utf-8"?>

    <rdf:RDF
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
      xmlns="http://purl.org/rss/1.0/"
    >

      <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0">
        <title>Meerkat</title>
        <link>http://meerkat.oreillynet.com</link>
        <description>Meerkat: An Open Wire Service</description>
        <sy:updatePeriod>hourly</sy:updatePeriod>
        <sy:updateFrequency>2</sy:updateFrequency>
        <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>

        <image rdf:resource="http://meerkat.oreillynet.com/icons/meerkat-powered.jpg" />

        <items>
          <rdf:Seq>
            <rdf:li resource="http://c.moreover.com/click/here.pl?r123" />
          </rdf:Seq>
        </items>

        <textinput rdf:resource="http://meerkat.oreillynet.com" />

      </channel>

      <image rdf:about="http://meerkat.oreillynet.com/icons/meerkat-powered.jpg">
        <title>Meerkat Powered!</title>
        <url>http://meerkat.oreillynet.com/icons/meerkat-powered.jpg</url>
        <link>http://meerkat.oreillynet.com</link>
      </image>

      <item rdf:about="http://c.moreover.com/click/here.pl?r123">
        <title>XML: A Disruptive Technology</title>
        <link>http://c.moreover.com/click/here.pl?r123</link>
        <description>
          XML is placing increasingly heavy loads on the existing technical
          infrastructure of the Internet.
        </description>
      </item>

      <textinput rdf:about="http://meerkat.oreillynet.com">
        <title>Search Meerkat</title>
        <description>Search Meerkat's RSS Database...</description>
        <name>s</name>
        <link>http://meerkat.oreillynet.com/</link>
      </textinput>

    </rdf:RDF>