[Zope] Add objects to list through selection

The class term is defined as: class term: def __init__(self, id, title='', eqterms=[]): self.id = id self.title = title self.similar = eqterms def addmember(self, eqterms*): for term in eqterms: self.similar.append(term) where the addmember append the another term object to the similar list. where term objects is created in a folder called terms and searchable by catalog. How can a dtml to allow the selection from the folder or the search result to call addmember to add to a term the list of member terms?