The DOI system provides a persistent link destination for each article, regardless of the actual physical location of the article. Article URLs are maintained on the DOI proxy server http://dx.doi.org. This central server is the target of all DOI-based links. The DOI server redirects all links to the appropriate actual location.
An AMS article currently residing on an AMS machine might be have the URL:
This article is assigned at DOI of:
DOI-based persistent links to this article can be constructed with the syntax:
The DOI server translates the DOI-based link into its actual URL on the AMS server. If the article were to moved to a different AMS location, the DOI-based URL would redirect to the new location. It is the responsibility of each publisher to ensure that the current information is registered for each DOI.