[Bug 19548] [XP30] Higher-order functions feature

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19548

--- Comment #1 from Jonathan Robie <jonathan.robie@gmail.com> ---
XPath a component used in other specifications, which are allowed to subset it
or extend it, as long as they do not change the syntax or semantics of the
things defined in the XPath spec. Given that, what does it mean for a feature
to be optional?

We currently say that static typing is a optional feature in XPath, no other
features are optional. That's because static typing actually does change the
semantics, and we allow implementations to interpret the spec with or without
static typing.

But I don't think we need to do the same for higher order functions.

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