Declare the Coolest XQuery Variables

Here's how to declare some important variables in XQuery:

Use this variable to pass an XML tree to a XQuery query.

declare variable $v as document-node(element(*,xdt:untyped)) external;:

These declare an XQuery variable into a namespace.

declare namespace nameSpace="http://nameSpace.org";
declare variable $nameSpace:v as xs:decimal:= 0.19;

This declares an XQuery variable that acts as an XML node.

declare variable $v as node() := ...:

Declares an XQuery variable that acts as an XML attribute.

declare variable $v as attribute() := ...: 

Declares an XQuery variable that acts as a XML element.

declare variable $v as element() := ...: