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doi-content-negotiation

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Retrieve structured metadata from any DOI via HTTP content negotiation

skills/literature/metadata/doi-content-negotiation/SKILL.md

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# DOI Content Negotiation

## Overview

Any DOI can return structured metadata in multiple formats through HTTP content negotiation — simply set the `Accept` header when requesting `https://doi.org/{doi}`. This is the most universal way to get citation metadata, BibTeX entries, JSON-LD, and RDF from any publisher without needing a specific API. Works for all 300M+ registered DOIs. Free, no authentication.

## Usage

### Basic Content Negotiation

```bash
# Get JSON citation metadata (Citeproc JSON)
curl -LH "Accept: application/vnd.citationstyles.csl+json" \
  "https://doi.org/10.1038/nature14539"
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