[om] Manipulating Structured Data

[David Carlisle]

  Lets say I wish to 
  sum up the (P.quantity) attribute of the list members.  Any suggestion how I 
  could deal with this situation?

use map

http://monet.nag.co.uk/cocoon/openmath/cd/list1.html#suchthat

to generate the list of things you wantt o sum, then apply sum to that
list.

David

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