Can I substitute a predefined path/expression within t

Hello folks,

I have several references in my stylesheet to a pattern that resembles:

Node[@name='AA' or @name='BB']

With time, I continuously need to update this pattern to include newer
attributes @name='CC', @name='DD' and so on.

Instead of repeating this addition in every match in the stylesheet, 
I am wondering if there is some way to store this path/expression:

myexpression = "Node[@name='AA' or @name='BB']" or
myexpression = "@name='AA' or @name='BB' "

and use 'myexpression' in my pattern matches. That way, I will have 
only one location to update. I have tried using variables without success.

Any help?

Ganesh Murthy
mailto:Ganesh.Murthy@xxxxxxxx
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