Look up a work's publication date directly from its own landing page

Fallback for when OpenAlex has no record for a work at all (an arXiv preprint, a conference proceedings entry, an institutional repository item, ...): tries, in order, HTML `citation_*` meta tags, schema.org `datePublished` JSON-LD, and - for a reference that is itself a PDF with no separate landing page - the PDF's own `Created` metadata via `pdftools::pdf_info()`.

Usage

get_page_publication_date_result(url)

Arguments

url

The paper reference URL (typically the same URL used for the OpenAlex lookup)

Value

A list with `status` ("found", "absent" or "failed") and `value`, an ISO "YYYY-MM-DD" string or NA_character_