This is not an attribute, but the namespace pseudo-attribute. The value provides a prefix to use for the XLink linking attributes. All namespace prefixes must be associated with a URL, and the prefix “xlink” has been set to the URL for the World Wide Web Consortium (W3C) XLink Recommendation.
| Value | Meaning |
|---|
| http://www.w3.org/1999/xlink | The prefix “xlink” has been set to the URL for the W3C XLink Recommendation. |
| Restriction: Restriction: This attribute value may not be
changed. |
<abbrev>,
<award-group>,
<award-id>,
<bio>,
<chem-struct>,
<collab>,
<conference>,
<contrib>,
<custom-meta>,
<element-citation>,
<email>,
<ext-link>,
<funding-source>,
<funding-statement>,
<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 |
|---|
| http://www.w3.org/1999/xlink | When this attribute is used, the prefix “xlink” should be set to the URL for the W3C XLink Recommendation. |
| Restriction: This is an optional attribute; there is no default. |