Extract and Normalize DOI from Zotero Item Data

Inspects a Zotero item's metadata list for a DOI, checking the primary DOI field first, followed by the extra field if necessary. Automatically normalizes URL prefixes and validates the '10.' prefix structure.

Usage

extract_doi(data)

Arguments

data

List. The data element of a Zotero API item list (e.g., item$data).

Value

Clean character string containing the DOI, or NULL if no valid DOI is found.