TAILIEUCHUNG - XML in 60 Minutes a Day phần 9

để tạo ra một mục tiêu tài liệu. Chúng tôi đưa bạn bước theo các bước thông qua một Nhưng chúng tôi sẽ cho bạn thấy những điều cơ bản bằng cách thảo luận về lý do tại sao sự biến đổi là cần thiết | 546 Chapter 14 intervene cancel or otherwise modify the nature of the information to be delivered or the delivery schedule. CDF differs from most XML-related languages in two major ways There is no universal DTD for it so its documents need only be well formed and not necessarily valid. However individual Web publishers can create their own validity documents to test against for validity. The CDF specification is presently only a W3C Note with no realistic prospect of ever becoming a W3C Recommendation. Nevertheless Microsoft continues to develop and refine CDF just as it continues to develop successive versions of IE. Additionally CDF enables automatic user notification when Web site content changes. It has what are called other data operations too the ability to search index profile filter and personalize content. When downloaded to an end user s browser CDF channels resemble local links to and indexes of remote resources. They are links that if you are online in other words if you are connected to the Web can take you directly to the Web site source. If you are not online but are using the offline browser options you can configure your channels to display their content whenever you want to even if you are not connected to the Web as long as your system was given an opportunity to go on online and download the information to your hard disk. The Publisher s Side of CDF Creating CDF Channels So far we have examined channels from a user s standpoint. Now let s examine CDF from the Web publisher s side to see how channels are created and added to Web sites. We stated earlier that a channel is a collection of information commonly considered to be specific Web pages within one Web site. We can put the specifications for any single channel in one CDF document which is an XML-related document or we can create hierarchies of channels and subchannels within one CDF document. In fact you may have noticed that in your list of example surviving Web sites that provide the .

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