Creating a Library Module

An XQuery module consists of:

l The module namespace definition

l One or more function declarations for user-defined functions

Consider the following example of a simple XQuery library module that contains two user-defined functions - total-price and titleQuantity:


module namespace ns = "urn:utils"; declare function ns:total-price( $i as element) as xs:decimal { let $subtotals := for $s in $i return $s/quantity * $s/USPrice return sum( $subtotals ) }; declare function ns:titleQuantity($GROUP_28, $row) { <book> <title> {$row/title/text()} </title> <quantity> {$GROUP_28/QTY/QTY01/QTY0102/text()} </quantity> <ISBN> {$GROUP_28/LIN/LIN03/LIN0301/text()} </ISBN> </book> };

You create an XQuery library module by typing the module definition in the XQuery editor. If you copy/paste user-defined functions from other XQuery, make sure to change the namespace prefix for each user-defined function as described in the following section, About Namespaces.

About Namespaces

An XQuery library module requires a namespace definition. You can specify the namespace using

l A symbolic name, like the one shown in the previous example

l A URI, such as "http://example.com/xquery/library/book"

The prefix you assign to the namespace must be used with any user-defined functions you declare in the XQuery library module. For example, if you create a user-defined function using the Stylus Studio refactoring feature, you must replace the default namespace that was created with the user-defined function (local:) with the namespace associated with the XQuery library module (ns:, in the previous example).

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Creating a Library Module

About Namespaces

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