See 
PublishedAPI for packages intended to be used by Plugin and Contrib authors, or 
browse all packages.
See also 
Developing plugins, 
Developer's Bible, 
Technical Overview
A collection node in a configuration item tree; a collection
of configuration items and subsections.
IMPORTANT: there are some naming conventions for fields that apply to
all subclasses of this class. See 
Foswiki::Configure::Item for details.
 ClassMethod new(@opts) 
 
-  @opts- array of key-value options, e.g. headline => 'Security Settings'
Constructor.
 ObjectMethod addChild($child) 
Add a child node under this node.