The Autolink DOIs LibApp finds the item’s DOI on a page and prepares a Summon search for the DOI and then creates a link on the DOI. If the user’s library does not have a copy of the item, the LibApp will offer the ILL service to the user to make a request for that item to be loaned to the library. It also displays a tool tip that shows the article that the DOI corresponds to.
The image below shows how the DOI on this Nature.com page is now linked by the Autolink DOI LibApp. The screenshot was taken with the cursor hoovered over the link when the Summon widget service was turned on. The tool tip displays more information about this item.
It should also be noted that if the DOI on the page is already written with a link, the LibApp will not override that link.
When the Summon API proxy is used, the tool tip shows very detailed information. Do note that the use of the Summon API proxy does require an API key and that you run our proxy on your machine. Anyone, however, can use the Summon widget service immediate, provided they are a Summon customer. When the Summon widget service is used, the tool tip displays less detailed information but does include the publication information.
The LibApp find the DOI by searching for a “10.” string followed by a string of four more integer digits, then a “/” followed by an item ID, which can be of any length, then a whitespace IIRC.