[Zope] dynamically change sql query in zope?

hallo, i would like to dynamically change the search where field in the sql query in zope. when i do this, zope interpretes the variable FIELD as string. is there a way to dynamically change a sql query? thanks for any help, alex -------------- FIELD S_TITLE1 select * from Annotation WHERE <dtml-sqlvar FIELD type=string> = <dtml-sqlvar S_TITLE1 type=string>