A URI reference pointing to some resource that describes the role or function of a link.
<abbrev>,
<award-group>,
<bio>,
<chem-struct>,
<collab>,
<conference>,
<contrib>,
<custom-meta>,
<element-citation>,
<email>,
<ext-link>,
<funding-source>,
<graphic>,
<inline-graphic>,
<inline-supplementary-material>,
<institution>,
<license>,
<long-desc>,
<media>,
<mixed-citation>,
<named-content>,
<nlm-citation>,
<product>,
<related-article>,
<related-object>,
<self-uri>,
<supplementary-material>,
<uri>| Value | Meaning |
|---|
| Text, numbers, or special characters | The URI of a resource that describes the role, reason, or rationale for the
link. |
| Restriction: This is an optional attribute; there is no default. |