[Zope] Namespace question

[complaw@hal-pc.org]

I have an object with a built-in method (called "check_id") for determining
whether the value from a retrieved object has the same id as one of the elements
in the current object's lines property.

What I want to do is make an edit form that has a <SELECT> element with a
complete list of object id's of a given type (meta_type = 'Doctrine') and
compare each of those id's to the id's stored in the current object's lines
property.  If there is a match, I want the <OPTION SELECTED> statement written. 
Otherwise, it would be simply <OBJECT>.  

Note, the Doctrine object has (of course) an id.  The lines property has a list
of id's that are subsets of the total number of Doctrine objects.

Here is the code...


<SELECT NAME="doctrines:list" SIZE="5" MULTIPLE>
  <dtml-in "objectValues('Doctrine')">
    <dtml-if "check_id(sequence-item.id)">
      <OPTION VALUE="<dtml-var id>" SELECTED><dtml-var title></OPTION>
    <dtml-else>
      <OPTION VALUE="<dtml-var id>"><dtml-var title></OPTION>
    </dtml-if>
  </dtml-in>
</SELECT>


The question that I have is that <dtml-if "check_id(sequence-item.id)"> doesn't
work.  Any hints as to what the problem might be?

TIA,

Ron