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The equivalence for fn:outermost is very difficult to read because you have a dot followed by a dot in a slightly different font. So you do not really know if it should end with /.. or /. Perhaps put parentheses around the expression
Thanks for pointing it out. This is why, in by book, I used chevrons to separate code samples from narrative text. Shame that we can't use that solution here. I'll fix it somehow.
I have resolved this by putting the equivalent expression into <eg> markup which should make it appear in a paragraph-level code block.