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xlink:type Type of Link

The kind of link used with an element. For all elements in this Tag Suite that can take links (except the <mml:math> element), this attribute may be either omitted or set to the word “simple”, which means that the link is a simple, one-ended link. For the <mml:math> element, the attribute may take additional values that describes the link type.

Usage/Remarks

For all elements (except <mml:math>), the only valid value for the attribute is the word “simple”, but the attribute is optional and may be omitted. For the <mml:math> element, the attribute best practice will restrict the value to one defined in the MathML and XLink specifications; see them for further details.
OPTIONAL on many elements; click for list and usage

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

Value Meaning
simple The link is an XML simple (one-ended) link.
Restriction @xlink:type is an optional attribute, but if used, is restricted to the word “simple”.
Tagged Sample

<ext-link> is simple (one-ended) link 

...
<ext-link ext-link-type="uri" xlink:type="simple"
  xlink:role="http://www.mulberrytech.com/walkthewalk.html"
  xlink:title="XML-based slideshow application"
  xlink:actuate="onRequest" xlink:show="new"
  xlink:href="http://www.mulberrytech.com/slideshow/index.html">
 Mulberry Slideshow XML</ext-link>
...