XQuery/Namespace Constructors
< XQuery
Motivation
[edit | edit source]You want to dynamically create namespaces within a document.
Method
[edit | edit source]Use the XQuery namespace constructor. It has the format very similar to the element and attribute constructors:
namespace {prefix} {uri} Example
[edit | edit source]declare function local:usage-meta($new-collection as xs:string, $resource as xs:string) { let $schema := doc($new-collection || '/' || $resource)//xs:schema let $targetNamespace := $schema/@targetNamespace/string() let $metaNamespace := $targetNamespace || '-META' let $named := $schema/xs:element/@name/string() let $referenced := $schema//xs:element/@ref/string() let $top := distinct-values($named[not(.=$referenced)]) let $newSchema := element xs:schema { namespace { "xs" } { "http://www.w3.org/2001/XMLSchema" }, namespace { "" } { $metaNamespace }, namespace { "usage" } { $targetNamespace }, namespace { "vc" } { "http://www.w3.org/2007/XMLSchema-versioning" }, attribute { "targetNamespace" } { $metaNamespace }, attribute { "elementFormDefault" } { "unqualified" }, attribute { "attributeFormDefault" } { "unqualified" }, attribute { "vc:minVersion" } { "1.0" }, attribute { "vc:maxVersion" } { "1.01" }, element xs:import { attribute { "namespace" } { $targetNamespace }, attribute { "schemaLocation" } { $resource } }, element xs:element { attribute { "name" } { "META" }, element xs:complexType { element xs:choice { attribute { "minOccurs" } { "0" }, attribute { "maxOccurs" } { "unbounded" }, for $topElement in $top return element xs:element { attribute { "ref" } { "usage:" || $topElement } } } } } } (: <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="{$metaNamespace}" xmlns:usage="{$targetNamespace}" xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" targetNamespace="{$metaNamespace}" elementFormDefault="unqualified" attributeFormDefault="unqualified" vc:minVersion="1.0" vc:maxVersion="1.01"> <xs:import namespace="{$targetNamespace}" schemaLocation="{$resource}"/> <xs:element name="META"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> {for $topElement in $top return <xs:element ref="usage:{$topElement}"/> } </xs:choice> </xs:complexType> </xs:element> </xs:schema> :) return xmldb:store($new-collection, 'META_' || $resource, $newSchema) }; Acknowledgement
[edit | edit source]This example was contributed by Loren Cahlandar in Dec. of 2013