In Elements

<bio> Biography

<chem-struct> Chemical Structure (Display)

<citation> Citation

<collab> Collaborative (Group) Author

<contrib> Contributor

<email> Email Address

<ext-link> External Link

<graphic> Graphic

<inline-graphic> Graphic, Inline

<inline-supplementary-material> Inline Supplementary Material

<institution> Institution Name: in an Address

<named-content> Named Special (Subject) Content

<nlm-citation> NLM Citation Model

<product> Product Information

<related-article> Related Article Information

<self-uri> URI for This Same Article Online

<supplementary-material> Supplementary Material

<uri> Uniform Resource Indicator (URI)

Value	Meaning
Data characters	The URI of a resource that describes the role, reason, or rationale for the link.
Restriction: This attribute may be specified if the element is used.