To those questions I would add another one:
why "if" xpath 2.0 expression demands "else" part?
IfExpr ::= "if" "(" Expr ")" "then" ExprSingle "else"
ExprSingle
The main reason was to avoid the infamous dangling-else ambiguity:
if (c) then if (d) then e else f
I personally would have preferred the solution of a closing token such as
"end-if" or "fi".
I do remember a half-day spent on if/then/else, where it was clear that
no-one much liked the status-quo syntax, but no-one could come up with
improvements that had majority support.
Michael Kay
http://www.saxonica.com/
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