Default XML namespace statement

The default xml namespace statement is used to specify the default E4X namespace used for lookups where the XML prefix is omitted, influencing the surrounding frame’s [[DefaultNamespace]] internal property; in other words, it can be said that default xml namespace is block-scoped.

namespace Samurai = "http://www.samurai.com/2007"

{
    default xml namespace = Samurai
    xn = <Envato>swiss</Envato>
}

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 the [[DefaultNamespace]] internal property 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

DefaultXMLNamespaceStatement :
default [no line break] xml [no line break] namespace = NonAssignmentExpression^allowIn