The screen for creating and configuring the navigation hierarchy configuration documents is accessible via the Administration > Configuration > Navigation hierarchies node:
The navigation hierarchy configuration is divided over several XML documents. It operates on a similar principle to schema extension: all documents are merged to generate a single document containing the whole configuration. This document cannot be edited, and is displayed via the "Preview" tab.
The edit field provides the content of the XML document:
The "Name" edit control lets you enter the document key consisting of the name and namespace. The "name" and "namespace" attributes of the <navtree> element are automatically updated in the XML edit field of the schema.
The preview automatically generates the merged document containing the complete configuration: