constructor xpointer module main module library module module declaration xquery prolog xquery version namespace declaration default namespace declaration variable declaration module import function declaration function body return type parameter list parameter type declaration sequence type occurrence indicator item type single type atomic type query body expressions single expression for let where expression where clause for clause let clause in variable binding positional variable let variable binding order by clause order specification list order specificator order modifier quantified expression quantified in variable binding if expression or expression and expression instance of treat as castable as cast as comparison expression range expression additive expression multiplicative expression unary expression union expression intersect expression path expression relative path expression step expression axis expression predicates predicate forward or reverse step abbrev step forward axis specifier axis reverse axis specifier node test name test wild card filter step primary expression literal numeric literal parenthesized expression function call function parameters context item expression kind test qualified name enclosed expression enclosed attribute expression