Those are attribute holding behaviour related informations:
xlink:showindicate expected behaviour on traversal effect:
embedthe link target should be included like <IMG>
newthe link target should create a new rendering, like opening a new window.
replacethe link target should replace the resource containing the link, like <A> in most cases.
xlink:actuateindicate expected triggering of link:
autoindicate at link detection time, like <IMG> if autoloading of images is turned on.
onRequestindicate activation at user's request, like <A>
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