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=head2 FLAGS

=over

=item tree

Normally, the expansion of the depth is along the selected document's
branch.  Only siblings of direct ancestors are shown, not those siblings
children.  This is in keeping with traditional navigation practice.  This
flag overrides this convention, expanding all parent nodes to the depth of
the tree or the maxdepth attribute, whichever comes first.  It is primarily
of use in drawing site-maps.

=item onlynodes

Do not display end-documents, i.e. those Pages without children.

=item reverse

reverse the sort indicated in "sort" above.