Like in JavaScript, it is possible to navigate through objects and arrays. This is a specific JSONiq extension.

JSONiq also allows to filter sequences with a predicate and predicates are fully W3C-conformant.

JSONiq supports filtering items from a sequence, looking up the value associated with a given key in an object, looking up the item at a given position in an array, and looking up all items in an array.

Figure 43. PostfixExpr