Open Library identifier support

[StevanWhite]

Open Library is used to reference lots of online materials, for instance https://openlibrary.org/works/OL18103893W

It would be useful for the biblatex package to provide a default means of handling such references.

I have used these declarations

\DeclareFieldFormat{eprint:openlibrary}{%
  openlibrary\addcolon\space
  \ifhyperref
    {\href{https://openlibrary.org/#1}{\nolinkurl{#1}}}
    {\nolinkurl{#1}}}
\DeclareFieldAlias{eprint:OpenLibrary}{eprint:openlibrary}

This is used in a biblatex reference like this

    eprint =    {works/OL18103893W};
    eprinttype =    {openlibrary},

to produce an annotation like this in the PDF file: openlibrary: books/OL23475181M which provides the above URL to a page where the resource can be found.

See Developer Center / APIs

Open Library has multiple APIs: "works", "edition", "isbn", "books", One could make a separate eprinttype for each of these, but I don't think there is much advantage to the user.