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pmc-oai-api

PubMed Central OAI-PMH metadata harvesting

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# PMC-OAI API Guide

## Overview

PubMed Central (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM). The PMC OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) service provides a standardized interface for systematically harvesting metadata and full-text content from the PMC archive.

The OAI-PMH protocol is an internationally recognized standard for metadata harvesting, widely used by libraries, repositories, and research infrastructure. The PMC implementation allows researchers to programmatically discover and retrieve article metadata, including titles, authors, abstracts, MeSH terms, publication dates, and links to full-text XML and PDF versions. This is particularly valuable for building local search indexes, systematic review pipelines, and text mining corpora.

Biomedical researchers, systematic reviewers, bioinformaticians, medical librarians, and text mining specialists use the PMC OAI-PMH service to harvest large collections of open-access biomedical literature for meta-analyses, natural language processing research, knowledge graph construction, and institutional repository enrichment. PMC contains over 9 million full-text articles, making it one of the largest open-access biomedical literature collections in the world.

## Authentication

No authentication required. The PMC OAI-PMH service is freely accessible without any API key, token, or registration. All requests are made via standard HTTP GET requests. However, users must comply with NCBI usage guidelines and respect the rate limits to ensure fair access for all users.