Tamino XQuery User Guide - Software AG Documentation

Advanced Usage
declare default element namespace "http://company.dot.com/namespaces/corporate"
for $a in input()/bib/book
return
{ $a }
The default element namespace applies to all unqualified element names, in both expressions and
constructors, unless a different default namespace is defined in an inner scope, as shown in the
following example:
declare default element namespace "X"
declare namespace y="Y"
let $x := {element x2{{element x4{}}}}
return $x/x2/y:x3/y:x4
In this example, the default element namespace applies to all occurrences of x1 and x2; however,
it does not apply to x3 and x4, because their default namespace is defined by the inner specification
xmlns="Y".
The default element namespace does not apply to attribute names.
There is no default attribute namespace.
There is a default function namespace. It applies to function names in function definitions and
function calls.
Tip: You need not declare a namespace in the prolog if you use one of the predeclared
namespaces. You can find the list of predeclared namespaces in the description of
NamespaceDecl in the XQuery Reference Guide
User-Defined Functions
In addition to the large set of XQuery functions as defined by the W3C and those that are specific
to Tamino, you can write your own functions. User-defined functions consist of a function header
representing its signature and the function body containing an XQuery expression. The header
consists of an identifier, a list of parameters and corresponding type information, and the type of
the return value. Type information is optional: if you omit it, item* will be assumed. Note that
the set of allowed types is restricted to all simple types and some common XQuery types (the
reference description of FunctionDecl contains a complete list).
The function identifier must be a QName together with a non-empty namespace prefix. To avoid
introducing a new namespace for locally used functions, that is functions used in the current
module, XQuery provides an implicit namespace to which the prefix local is bound. This is an
example for a function that uses this local namespace:
XQuery User Guide
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