Hello, I noticed that the lookup operator (?) accepts as key expression also non-parenthesized expressions, e.g.:
$map?$key It seems to me that the XQuery spec does not allow that - the key specifier must be an NCName, an integer, * or a parenthesized expression [1]: [126] KeySpecifier ::= NCName | IntegerLiteral | ParenthesizedExpr | "*" So only this should be allowed: $map?($key) But I am not quite sure if I do not overlook something. *My question*: is the acceptance of non-parenthesized key expressions conformant behaviour, or a (certainly intended) laxness? Kind regards, Hans-Jürgen [1] https://www.w3.org/TR/xquery-31/#id-lookup
