Dear Tobias,
No, there is no "tree" feature module in Xy-pic. The closest is the
"graph" feature described in the reference manual.
Enjoy,
Kristoffer
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Kristoffer H Rose, Ph.D. <krisrose@us.ibm.com> +1(914)784-7642 (fax 6324)
IBM T. J. Watson Research Center, PO Box 704, Yorktown Heights, NY 10598