. Objlabel, Obj(t)(btex N etex) "labpathname(N)

. Objlabel, treepos(Obj(t))(2)(btex L etex) "labpathid(1)

. Objlabel, 1)(btex l etex)labpathid(1), "labdir(lft)"; % The previous is a shorthand for % ObjLabel, treepos(treepos(Obj(t))(2))(1)(btex l etex) % "labpathid(1)

. Objlabel, ntreepos(Obj(t))(2,1)(btex r etex) "labpathid(2)

. Objlabel, ntreepos(Obj(t))(2,2)(btex r etex) "labpathid(2)

. Objlabel, treepos(Obj(t))(4)(btex $(0,0,0)$ etex

D. Girou, Building high level objects in PSTricks Slides presented at TUG'95, 1995.

M. Goossens, S. Rahtz, and F. Mittelbach, The L A T E X Graphics Companion: Illustrating documents with T E X and PostScript, 1997.

J. D. Hobby, A User's manual for MetaPost, 1992.

N. Samuel, D. Kamin, and . Hyatt, A Special-Purpose Language for Picture-Drawing, USENIX Conf. on Domain-specific Languages, pp.297-310, 1997.

E. Donald and . Knuth, The metafontbook, 1986.

E. Donald and . Knuth, Digital Typography, CSLI Lecture Notes. CSLI, vol.78, 1999.

. Che-für-grafiken, Diplomarbeit an der Rheinischen Friedrich- WilhelmsUniversität Bonn, 1998.

D. Roegel, Creating 3D animations with metapost, TUGboat, vol.18, issue.4, pp.274-283, 1997.

T. Kristoffer-høgsbro-rose and X. Tugboat, Very High Level 2-dimensional Graphics, pp.151-158, 1997.

T. Van and Z. , PSTree user's guide, 1993.

T. Van and Z. , PSTricks: PostScript macros for Generic T E X; User's Guide, 1993.