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xlink:title Title of the Link

Describes the function of a link’s remote resource in human-readable fashion.

Usage/Remarks

This attribute’s value, i.e., “the link title”, may be displayed at the point in an online document where the link occurs. A user could read the title and determine whether to follow the link.
OPTIONAL on many elements; click for list and usage

<abbrev>, <article-version>, <award-desc>, <award-group>, <award-id>, <award-name>, <bio>, <chem-struct>, <collab>, <conference>, <contrib>, <custom-meta>, <element-citation>, <email>, <ext-link>, <extended-by>, <funding-source>, <graphic>, <inline-graphic>, <inline-media>, <inline-supplementary-material>, <institution>, <issue-id>, <license>, <long-desc>, <media>, <mixed-citation>, <named-content>, <nlm-citation>, <product>, <pub-id>, <related-article>, <related-object>, <resource-name>, <restricted-by>, <self-uri>, <supplementary-material>, <support-source>, <uri>, <volume-id>

Value Meaning
Text, numbers, or special characters A descriptive, human-readable title that acts as a brief description of the link.
Restriction @xlink:title is an optional attribute; there is no default.
Tagged Sample

<supplementary-material> is a local file 

...
<supplementary-material id="S1" xmlns:xlink="http://www.w3.org/1999/xlink"
  xlink:title="local_file" xlink:href="pbio-0020328-t002.xls"
  mimetype="application/vnd.ms-excel">
 <label>Supporting Material</label>
 ...
</supplementary-material>  
...