Darn, never mind.  Discovered the " />" at end of <options from_data_table="bccdc_blast_fields" /> was of course causing all the <filters> that followed to be ignored.   

Thanks to those who may have chipped in on this one. (I get digest mode).

d.



From: "damion@learningpoint.ca" <damion@learningpoint.ca>
Sent: 30 October 2013 14:24
To: galaxy-user@lists.bx.psu.edu
Subject: Tool XML form building bug with <options from_data_table="..."> ?

Has anyone run into this?  I'm building a general-purpose filter control on my galaxy tool xml template for enabling numeric fields to be filtered by > < etc. parameters - in a user friendly way.  I have a select list <para> driven by a data table:
...
  <param name="filter_column" type="select" label="Col">
<options from_data_table="bccdc_blast_fields" />
  </param>
...