Pod::Abstract::Tree - Manage a level of Pod document tree Nodes.

       Ben Lilburne <bnej@mac.com>

       Copyright (C) 2009 Ben Lilburne

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

perl v5.30.0                                       2020-05-17                           Pod::Abstract::Tree(3pm)

       Pod::Abstract::Tree keeps track of a set of Pod::Abstract::Node elements, and allows manipulation of that
       list of elements. Elements are stored in an ordered set - a single node can appear once only in a single
       document tree, so inserting a node at a point will also remove it from it's previous location.

       This is an internal class to Pod::Abstract::Node, and should not generally be used externally.

detach
        $tree->detach($node);

       Unparent the $node from $tree. All other elements will be shifted to fill the empty spot.

   push
       Add an element to the end of the node list.

   pop
       Remove an element from the end of the node list.

   insert_before
        $tree->insert_before($target,$node);

       Insert $node before $target. Both must be children of $tree

   insert_after
        $tree->insert_after($target,$node);

       Insert $node after $target. Both must be children of $tree

   unshift
       Remove the first node from the node list and return it.

       Unshift takes linear time - it has to relocate every other element in id_map so that they stay in line.

   children
       Returns the in-order node list.

   index_relative
        my $node = $tree->index_relative($target, $offset);

       This method will return a node at an offset of $offset (which may be negative) from this tree structure.
       If there is no such node, undef will be returned. For example, an offset of 1 will give the following
       element of $node.

       Pod::Abstract::Tree - Manage a level of Pod document tree Nodes.