Use XML directive

The use xml pragma is used to provide a XMLContext object at the surrounding frame for configuring the XML/XMLList data types.

var ctx:XMLContext, xn:XML

ctx = { ignoreWhitespace: true }

{
    use xml ctx
    xn = <information>{"  content  "}</information>
}

This affects not only the lexical scope, but also external function calls that are called subsequently from the same scope or nested scopes during runtime.

Note: Internally functions receive a hierarchical environment frame reference, which is decently optimized, where every frame contains a ?context local that includes a XMLContext reference that may be a null pointer (which means skip to parent frame).

Thus, that syntactic construct should work with both synchronous and asynchronous code.

Syntax

UseXMLDirective :
use xml ListExpression^allowIn