cdf, and a link on your site should point to this file so that users can subscribe to the channel.Ī typical CDF file defines a channel hierarchy for the different Web sites making up the Active Channel. The CDF file must be saved with the extension. This will allow the content of the site to be webcast to user’s browsers. You simply create a CDF file using a text editor such as Microsoft Notepad and include it in your site.
Cdf definition download#
CDF files provide a mechanism for allowing users to select the content they want to download from a Web site, and they let administrators schedule content for delivery to user’s desktops.ĬDF files are used to convert existing Web sites into Active Channels without the need to change the existing site in any way. CDF files are based on the Channel Definition Format (CDF) standard. CDF FileĬDF Files are text files used for creating Active Channels, Active Desktop items, and channel screen savers for managed webcasting of content to user’s desktops. True webcasting is supported by Microsoft NetShow for delivery of content using IP multicasting. NOTEĬDF is not true webcasting in the sense of Internet Protocol (IP) multicasting because it is a “pull” technology. User control: The user can use CDF to specify which portions of a site to download to his or her browser, instead of pulling a lot of content off the site and hoping that it contains the needed information.Administrator control: The administrator can control how much of the site can be downloaded by users.Personalization: Standard Hypertext Transfer Protocol (HTTP) cookies can be used to deliver personalized information to users.
Cdf definition how to#
Channel updates are accomplished by scheduled Web crawls, using either the publisher’s predefined schedule or a user’s customized one. The content for the channel is downloaded to a cache on the user’s system. The Active Channel then appears on the channel bar on the user’s desktop. The user clicks the link to subscribe to the Active Channel and download the CDF file. A link is then created to the CDF file on the Web site. It forms a kind of table of contents of the logical subset of the Web site that comprises the Active Channel. The CDF file is a simple text file that is formatted using XML. A Web site can be made into an Active Channel through the addition of a CDF file. Let’s consider the delivery of Web content to the user’s browser using Active Channels. Using CDF also reduces server load and allows delivery of just the needed content, instead of requiring users to download large quantities of unnecessary content. Based on the Extensible Markup Language (XML), Channel Definition Format (CDF) lets administrators create Active Channels for delivery of content through the users Web browser, and Active Desktop elements and channel screen savers for delivery directly to the users desktops.Ĭhannel content can be personalized, and delivery can be scheduled according to users needs and preferences. What is CDF (Channel Definition Format)Ĭhannel Definition Format was an open standard created by Microsoft for Microsoft Internet Explorer version 4 (and proposed as a standard to the World Wide Web Consortium) that defines a «smart pull» technology for webcasting information to users desktops. Channel Definition Format was an open standard that defines a «smart pull» technology for webcasting information to users desktops.
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