HTML5 RDFa and Microdata document

https://identifiers.org/pmc/PMC7811506
- http://www.w3.org/1999/02/22-rdf-syntax-ns#type
  - http://vocabularies.wikipathways.org/wp#PublicationReference
- http://xmlns.com/foaf/0.1/page
  - http://www.ncbi.nlm.nih.gov/pubmed/PMC7811506
- http://purl.org/dc/elements/1.1/source
  - PubMed Central
- http://purl.org/dc/terms/identifier
  - PMC7811506
- http://purl.org/spar/cito/cites
  - https://identifiers.org/wikipathways/WP145
  - https://identifiers.org/wikipathways/WP2433
  - https://identifiers.org/wikipathways/WP409
  - https://identifiers.org/wikipathways/WP276
  - https://identifiers.org/wikipathways/WP473
  - https://identifiers.org/wikipathways/WP632
  - https://identifiers.org/wikipathways/WP590
  - https://identifiers.org/wikipathways/WP131
  - https://identifiers.org/wikipathways/WP155