Digital object is a scholarly paper with two native identifiers - DOI and PMID. There are 3 associated datastreams - PDF, http access to PDF, and PubMed medatadata record. info:doi/10.356/24689 URI-4 This digital object represents a scholarly paper. JVBERi0xLjQNJeLjz9MNCjI2NCAwIG9iag08PCANL0xpbmVhcml6ZWQgMSANL08gMjY5IA0vSCBb.... info:pmid/12456789 URI-7 This digital object represents a PubMed bibliographic record. 12456789......