> 3. Have I caught all the constituents of the tree model and their properties
> or have I missed some?

Compare your output to the output of the stylesheets at

  http://skew.org/xml/stylesheets/ascii-treeview/

and

  http://www.cranesoftwrights.com/resources/showtree/

   - Mike
____________________________________________________________________________
  mike j. brown, fourthought.com  |  xml/xslt: http://skew.org/xml/
  denver/boulder, colorado, usa   |  personal: http://hyperreal.org/~mike/

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list