Intern:PDF

PDF files are linked in Pangaea via
 * DOI - if this is official part of the citation
 * urn:nbn - if this is official part of the citation
 * Handle - if a document is uploaded to ePIC

Older publications only existing on paper might be scanned (300 dpi) and converted to text by OCR (optical character recognition).

Any documents related to content in Pangaea should be stored in the PDF/A format. This is the ISO-19005-1 Electronic document file format for long-term preservation.