RSS 2.0 specifications

RSS is the abbreviation of Really Simple Syndication (for rss2.0, It is the abbreviation of these three words, for rss1.0, It is the abbreviation of RDF Site Summary, and 1.0 and 2.0 follow two systems)
RSS is based on XML. All RSS must comply with XML 1.0 standards published on the W3C website.
In an RSS document, the root element is <RSS> and has a required attribute version to indicate the RSS standards that this document complies with. If the RSS document complies with this standard, the version value must be 2.0.
<RSS> An element has only one subelement, containing information about the channel. A channel is a whole blog, and an item refers to an article or log (also called post ).

 

List of child elements of the rss2.0 element Channel

Element)	Description)	Value Range	Importance	Example)
Title	Channel name		Required	Goupstate.com news headlines
Link	Channel URL		Required	Http://www.goupstate.com/
Description	Channel description		Required	The latest news from goupstate.com, A Spartanburg Herald-Journal web site.
Language	Language used for Channel articles,	List of available Netscape or W3C recommendations	Optional	En-US
Copyright	Channel content Copyright		Optional	Copyright 2002, Spartanburg Herald-Journal
Managingeditor	Email of responsible editor		Optional	Geo@herald.com (George matesky)
Webmaster	Email of the website administrator responsible for Channel Technical Affairs		Optional	Betty@herald.com (Betty Guernsey)
Pubdate	The date when the channel content is published. The format follows the rfc822 format (the year can be two or four digits)		Optional	Sat, 07 Sep 2002 00:00:01 GMT
Lastbuilddate	Last modification date of channel content		Optional	Sat, 07 Sep 2002 09:42:31 GMT
Category	One or more category of the specified channel		Optional	<Category> newspapers </Category>
Generator	Program name for this channel		Optional	Mightyinhouse content system v2.3
Docs	URL that points to the format description of the RSS File		Optional	Http://blogs.law.harvard.edu/tech/rss
Cloud	Allows processes to register with a cloud to be notified of updates to the channel, implementing a lightweight publish-subscribe protocol for RSS feeds. More info here.		Optional	<Cloud domain = "rpc.sys.com" Port = "80" Path = "/rpc2" registerprocedure = "pingme" protocol = "Soap"/>
TTL	Validity Period, used to specify the maximum time that the channel can be cached	In minutes	Optional	<TTL> 60 </TTL>
Image	Specifies a GIF, JPEG, or PNG image to be displayed along with the channel.		Optional
Rating	Classification of this channel (mainly for adults, restrictions, and children)		Optional
Textinput	Specify a text input box for user input. The specific information and functions are not fixed.		Optional
Skiphours	Prompt the news aggregator, which can be skipped in those hours.		Optional
Skipdays	Prompt the news aggregator, which can be skipped in those days.		Optional

 

 

List of child elements of the image sub-element in the channel of rss2.0

Element)	Description)	Value Range	Importance	Example)
URL	Image URL		Required
Title	The title of the image, used for the HTTP alt attribute		Required
Link	Website URL (in reality, it is often replaced by the channel URL)		Required
Width	Image Width (in pixels)	The maximum value is 144. The default value is 88.	Optional
Height	Image Height (in pixels)	Up to 400, 31 by default	Optional
Description	The title attribute used for link.		Optional

List of child elements of cloud in element channel of rss2.0

Element)	Description)	Value Range	Importance	Example)
Domain	Domain name or IP address of the machine where the cloud program is located			Radio.xmlstoragesystem.com
Port	Port used to access the Clound Program			80
Path	Path of the Program (not necessarily the actual path)			/Rpc2
Registerprocedure	Services or processes that can be registered			Xmlstoragesystem. rsspleasenotify
Protocol	Protocol	XML-RPC, soap, or http-post		XML-RPC

List of child elements of the channel sub-element textinput in rss2.0

Element)	Description)	Value Range	Importance	Example)
Title	Label of the submit button		Required
Description	Description text input area		Required
Name	Name of the text area object		Required
Link	CGI program that processes submitted requests		Required

 

For the item content, see the bloggerapi Learning Based on XML-RPC.
Note:
Rss2.0 requires that the very beginning of the <link> and <URL> values must be registered in iana, such as http: // or https: // or FTP:.
An RSS file can contain elements that are not defined here, as long as they have been defined in a namespace.
A common problem is And

In some cases, the two are the same, but the former can refer to a certain position in a long article (that is, the so-called intra-page anchor ).