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CHANNEL Element

Obsolete. Defines a channel or subchannel.

Syntax

<CHANNEL
    BASE = "url"
    HREF = "url"
    LASTMOD = "date"
    LEVEL = "n"
    PRECACHE = "sCache">
<!-- child elements -->
</CHANNEL>

Attributes

BASE
Optional. Base URL for the channel. This is used to resolve relative URLs specified in ITEM and CHANNEL elements contained within this channel. The BASE attribute applies to all child elements of the current channel or subchannel. This attribute supersedes the BASE value previously defined by a parent CHANNEL element, if any exists. The URL specified must end with a trailing "/", or the last word will be removed.
Note  Channel Definition Format (CDF) supports only HTTP, Secure Hypertext Transfer Protocol (HTTPS), and File Transfer Protocol (FTP) protocols. If a different protocol is used, Windows Internet Explorer will fail to navigate to the page without notifying the user.
HREF
Optional. URL associated with the channel. The browser navigates to this location when the user activates the channel. The HREF attribute should be omitted if the CHANNEL element contains an anchor (A) as a child element.
Note  CDF supports only HTTP, HTTPS, and FTP protocols. If a different protocol is used, Internet Explorer will fail to navigate to the page without notifying the user.
LASTMOD
Optional. Last date/time in GMT that the page indexed by the HREF attribute was modified. GMT is Greenwich Mean Time, also known as Universal Time Coordinated (UTC). Note that the LASTMOD date/time is not necessarily your local time. This attribute allows the channel client to determine whether the content has changed since the last time it was downloaded. The item is downloaded only if the date associated with the cached item is older than the LASTMOD value in the CDF file. Additional information on optimizing channels is available in the Creating Active Channels documentation. The date format used in the LASTMOD attribute is specified in the form yyyy-mm-ddThh:mm, where:
yyyySpecifies the year.
mmSpecifies the month (01-12).
ddSpecifies the day of the month (01-31).
hhSpecifies the hour of the day (00-23).
mmSpecifies the minutes (00-59).
LEVEL
Optional. Number of levels (or links) deep the client should "site crawl" and precache the HTML content from the URL specified in the HREF attribute. The default is zero, which specifies to only precache the URL of the CHANNEL, along with any images it uses. If the URL contains frames, the client will also retrieve all content inside the frames. By default, the maximum number of levels that can be specified for site crawling is three.
PRECACHE
Optional. String that specifies whether content is downloaded.
NoContent is not downloaded and the LEVEL attribute is ignored.
YesDefault. Content is downloaded only if the user has specified that channel content should be downloaded.

Element Information

Parent elements CHANNEL
Child elements
May occur at most once A, ABSTRACT, LOG, LOGIN, LOGO, LOGTARGET, SCHEDULE, TITLE
May occur one or more times CHANNEL, ITEM, SOFTPKG
Minimum availability Internet Explorer 4.0
Minimum operating systems Windows 95, Windows NT 4.0

Remarks

Internet Explorer 7. The CDF (Channel Definition Format) is obsolete and should not be used.

The top-level channel is defined by the first occurrence of the CHANNEL element. All CHANNEL elements contained within the top-level channel represent subchannel folders that are used to create a hierarchy of channel items.

An optional "SELF" attribute can be added in the top-level CHANNEL to indicate the location of the CDF file to use for creating a channel subscription. Note that this attribute is unnecessary and is only supported for backward compatibility.

If more than one mechanism is used to specify a URL for a channel, Internet Explorer will look for URLs in this order of precedence:

  1. The HREF attribute of the CHANNEL element.
    
    <CHANNEL HREF="http://...">
    
  2. The HREF of the anchor ( A) element that is the immediate child of the CHANNEL element.
    
    <CHANNEL>
    	<A HREF="http://...">My Channel</A>
    

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