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Default values / optional parameters

[Contact the author to obtain the notebook mentioned - moderator]

The sample notebook shows how two functions defined in a very similar 
manner behave differently when using optional parameters. Question: How 
can I define a function whose optional parameter is a pattern requiring 
a specific head and has a given default value? Help says this is x_h:v 
but my example says that this does not work in some cases.

Dr. Hermann Klocker   Phone/Fax: +43-5672-65724
                      Mobile: +43-676-480 57 67
Gymnasiumstrasse 5/5, A-6600 Reutte, AUSTRIA
mailto:h.klocker at

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