Language conventions (DB2 XQuery)

Case sensitivity
XQuery is a case-sensitive language.

Whitespace
Whitespace is allowed in most XQuery expressions to improve readability even if whitespace is not part of the syntax for the expression. Whitespace consists of space characters (X'20'), carriage returns (X'0D'), line feeds (X'0A'), and tabs (X'09').

Comments
Comments are allowed in the prolog or query body. Comments do not affect query processing.