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Section 5.3.3 in ISO/IEC 23009-1:2014 defines that invalid references (e.g., invalide URI or cannot be resolved) specified by "@xlink:href" attribute shall be removed. That means, we should play it without error, and just ignore the corresponding element. It's similar to "urn:mpeg:dash:resolve-to-zero:2013". https://bugzilla.gnome.org/show_bug.cgi?id=774463
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