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Extract-citations-from-book.xsl allows to automatically extract bibliographic citations from content encoded in XML TEI. This data is then recorded in a separate XML file and can be deposited to the CrossRef database as part of the Cited-by service (https://www.crossref.org/services/cited-by/).

The program individuates and extracts every element that has been tagged as a bibliographic entry (<bibl>), except when it is a child of the <figure> element.

When the reference contains a DOI it is encoded as follows:

<citation key="ref1">
    <doi>10.1017/upo9781844652594</doi>
</citation>

On the other hand, when <bibl> does not contain a DOI it is converted into a <unstructured_citation> element:

<citation key="ref5">
    <unstructured_citation>Bentham, Jeremy, ‘An Introduction to the Principles of Morals and Legislation’, in Utilitarianism and Other Essays, ed. by Alan Ryan (London: Penguin Books, 2004).</unstructured_citation>
</citation>

The element <unstructured_citation> has been chosen over <structured_citation> because the task of inferring structured information from text formatting is excessively error-prone. Note that this program also removes any formatting from the bibliographical citation, as recommended by CrossRef.

This XSL transformation can be run in conjunction with the conversion tools hosted at https://github.com/OpenBookPublishers/XML-last, after the conversion has been completed and the result has been validated.

See https://support.crossref.org/hc/en-us/articles/215578403 for more on adding references to a CrossRef's metadata record.