# Method Parser.XML.NSTree.NSNode()->add_namespace()

Method add_namespace

  ``void` add_namespace(`string` `ns`, `void`|`string` `symbol`, `void`|`bool` `chain`)`

Description

  Adds a new namespace to this node. The preferred symbol to use to identify the namespace can be provided in the `symbol` argument. If `chain` is set, no attempts to overwrite an already defined namespace with the same identifier will be made.