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xlink:show Showing the Link

The intended presentation behavior for a link, specifically the manner in which the content of a link will be displayed, for example, as embedded material or in a separate window.
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
embed The link should be displayed as part of the initial document being viewed, i.e., the material will be “embedded” directly into the initial document.
new The link should be displayed as a new, separate window, frame, pane, or other presentation context.
none The presentation behavior is unconstrained, and no other markup is generally available in the link to assist an application in deducing the retrieval mechanism.
other The presentation behavior is unconstrained, but other markup is generally available in the link to assist an application in deducing the retrieval mechanism.
replace The link should be displayed in the same window, frame, pane, or other presentation context as the initial document, thereby “replacing” the document or other object being linked.
Restriction @xlink:show is an optional attribute; there is no default.
Tagged Sample

Linked object displays in a new tab or new window

...
<ext-link ext-link-type="url" 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>
...