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No idea what they meant by "xml islands" exactly. I am just spitballing ideas here.
I am thinking of the "object" tag that can fallback to an xhtml file but won't if it current data attribute content loads. So try taking each of those xhtml files and in the body have an object tag that defaults to link to an image then in the object tag's content keep the remainder of the body which will never get loaded.
You should be able to link to those xhtml files normally but the object tag will just load the image instead.
But I am not sure that it will do what you want, but it might be worth playing around with.
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