docs: String getLink(JsonNode linkNode) {
  		// Handle both representations of a link: as a string or as an object
  		// http://jsonapi.org/format/#document-links (v1.0)
  		if (linkNode.has(HREF)) {
  			// object form
  			return linkNode.get(HREF).asText();
  		}
  		return linkNode.asText(null);
  	}