If the clipboard contains the URL for an identifier, when you click the paste button, the URL is parsed to get the identifier. For example, if you have the Goodreads Metadata source plugin installed, and have "https://www.goodreads.com/book/show/13487260" in the clipboard and press the button, you should get "goodreads:13487260" added as an identifier. Not all metadata source plugins have the necessary method. All the ones I maintain do, and I have been meaning to go through the built-in ones to add it. It also works if you have the URL that matches one of the rules.
If the contents of the clipboard don't match a metadata source or a rule, it falls back to looking for an ISBN.
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