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This article describes how to create a Channel Definition Format (CDF) file and some of the tags used in the CDF file.
As a content provider, you can create one CDF file for each type of Channel you want for your Web site. A CDF file allows users to subscribe to your FrontPage Web as a Channel or a desktop component.
When users subscribe to your FrontPage Web as a Channel, they can browse your Web offline, display updates to your Web on their screen saver, and download or receive e-mail notifications when pages in your FrontPage Web are modified. This feature is available only in Web browsers that support Channel Definitions, such as Microsoft Internet Explorer, version 4.0.
Creating a Channel Definition Format FileYou can use the Channel Definition Wizard to create a CDF file in FrontPage 98, using these steps:
Channel TagsA CDF file is a text file that contains a list of HTML tags, which reference specific Web pages on a particular Web site. (These tags, along with the entire CDF file description, have been submitted to the Word Wide Web Consortium and are awaiting acceptance.) Some of the new HTML tags in the CDF file that are created by the wizard are discussed below.
All CDF files must begin with the following tag:
<?XML Version="1.0" encoding="iso-8859-1" ?>This identifies the file as an Extensible Markup Language (XML) file so that it can be processed appropriately by the browser.
The <Channel> and </Channel> tags start and finish the CDF file. You can use multiple <Channel> tags to create sub-channels. The hyperlink reference (HREF) attribute for this tag points to the top-level Web page in the Channel.
The <Title> tag allows you to specify a title for the Channel. You will be able to see this in the Channels list on the Favorites menu.
The <Abstract> tag allows you to specify a text string that displays a ToolTip when the mouse passes over an item. You can specify an abstract for the primary Channel and each item within the Channel.
The <LogTarget> tag allows you to specify a custom CGI script that records information about browsing habits of users logged on to the Channel.
The <Schedule> tag allows you to schedule the time intervals for updating subscriptions and delaying connections.
The <Log> tag specifies which graphics are used in the Channel Bar on the Windows active desktop and in the Channels list on the Favorites menu.
The <Item> tag denotes each individual page of content on the Web-site that you want to be displayed in the Channel.
The <Scope> tag defines whether the pages in the Channel are to be downloaded to the subscriber's computer or the subscriber must connect to your Web to view changes.
The Channel Definition Wizard outputs a valid CDF file. The Channel Definition Wizard does not create some of the advanced features that can be used in CDF files. These features are:
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
173920For more information about channel definitions, click the Index tab in FrontPage Help, type the following text
(http://support.microsoft.com/kb/173920/EN-US/ )FP98: General Information about Active Channel Technology
and then double-click the selected text to go to the Using Channel Definitions topic.
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