From Wikipedia, the free encyclopedia

Welcome!

Hello Page history, and welcome to Wikipedia. Thank you for your contributions; I hope you like the place and decide to stay!

Please read The Five Pillars of Wikipedia to help you get to know this place, and you might want to look at What Wikipedia is not to see what is and isn't suitable for Wikipedia.

And remember, don't submit copyrighted work without permission. By submitting your work you promise you wrote it yourself, or copied it from public domain resources — this does not include most web pages.

I hope you enjoy editing here and being a Wikipedian! By the way, please be sure to sign your name on Talk pages using four tildes (~~~~) to produce your name and the current date. If you have any questions, see the help pages or ask a question. Again, welcome!

- Other languages:

Page history

The revision history, also called page history or edit history, of all pages is available. It consists of the old versions, and also a record of the date and time of every edit, the user who made it, the edit summary, and a possible marking as "minor edit".

The policy of keeping the page history did not exist in the beginning of Wikipedia's existence, so the page history of that time is lost.

Every page has a link "Page history" to the list of edits. Also the Recent changes and Related changes pages have links to the histories of listed pages.

Every line represents one edit to the given page and the version resulting from it

• "last" is similar to "diff", explained in Recent changes
• "cur" gives the difference between this version and the current one (i.e., excluding the edit shown by pressing the "last" next to it), which is the cumulation of all later edits, including those which are not in this revision history because they were made after loading this page
• the date and time link to the version of that day and time, except that in the first line, which is about the latest edit at the time of loading this revision history, the date and time link to the current version, hence with the changes made after this revision history was loaded;

The "cur" and "last" features are similar to those in Enhanced Recent Changes, except for "cur" in the first line: it is not linked in the revision history, while in the Enhanced Recent Changes it gives the differences corresponding to the last edit; just after loading the revision history this is the same as the "cur" link of the second line gives, but if there have been edits after loading it is different.

For every version there is a box on the line. Marking two boxes gives the difference between the two versions. The box at the top corresponds to the latest edit, which is not necessarily the edit about which the info on the line is (another edit may have been made after loading the page history),

If the "move page" feature has been used in the past to change the name to the current one, the entire edit history of the article, before and after the move, is shown, but the move itself is not. The move itself is shown in the edit history of the page with the old title, which automatically has become a redirect page.

See also: en:Wikipedia:Usemod article histories.

Special:Export

Image history

An "image" (in the broad sense of an uploaded file) can be edited, or, more generally, be replaced by a different image, by uploading a new image file with the same name. Again all versions are kept. The image history listing forms part of the image description page, which appears when clicking on the image. The image history consists of this and the old versions themselves.

The image description page consists of three parts:

• description of the image
• "Image history"
• "Image links"

The description part has also an edit history; it is labelled, somewhat confusingly, Image:xxx Revision history. It should not be confused with the Image history.

Not kept are images which have been deleted (not to be confused with images that are no longer used in articles), the only record available is the upload log, deletion log and possibly the "votes for deletion" archive. Neither the latest nor older versions are kept by the system, hence it is not possible to undelete an image.

Revision history of articles containing images or templates

The actual history of an article with images is the combined effect of the revisions of the source text, including references to images, and the revisions of the images themselves.

As a result:

• Old versions of articles do not show corresponding old versions of images, but the latest ones, unless the file names of the images have changed.
• Changes in images are not shown in the page history of the article if the same image name was used.

Similar remarks apply for templates.

Archiving

Archiving texts in separate pages is superior to using the page history as archive: texts in archive pages can be found searching with Google and using the search feature of Wikipedia. Page histories can only be searched after applying Special:Export. Also, archive pages can be organized and titled afterwards in a suitable way, while e.g. edit summaries can not be supplied afterwards. However, an index of old versions of a page, with links to them, could be prepared. 红外测温 激光 雕刻机 传感器 压力传感器 温度传感器 传感器 佳能数码相机 柯达数码相机 卡西欧数码相机 索尼数码相机 GIS GIS地理信息系统 GIS|GIS地理信息系统|世纪安图 移民 诺省商业移民 企业家移民 投资移民 技术移民 澳大利亚移民 移民新西兰 和中移民 移民 投资移民 技术移民 移民加拿大 澳洲移民 移民英国 移民美国 移民案例 电子政务|世纪安图 sony投影机 液位变送器 液位计 液位开关 压力变送器 压力传感器 CCC CERTIFICATION GIS 医药电子商务 医药批发 药品批发 小型机 磁带机 sony投影机