Formless builds forms from descriptions of variables to be found to the form results.

class TaxonName(formless.Typed):
    """If we can validate the form entry as a scientific or common name,
    return tsn, else raise an error."""
    def coerce(self, val):
        val = val.strip ()
        txn = itis_if.tree.itis.findTaxonTsn (val)
        if txn == None:
            raise formless.InputError("'%s' not found " % val)
        return txn.tsn

class ILookup(formless.TypedInterface):
    def lookupName(self, name=TaxonName (
        label = "Taxon name (common or scientific):")):
        pass
    # Note that capitalization indicates word breaks here.
    
    lookupName = formless.autocallable(lookupName, action="Search")

class Main(rend.Page):
    __implements__ = ILookup, rend.Page.__implements__
    docFactory = rend.stan(
        tags.html[
            tags.body[
                tags.h1["Enter taxon name:"],
                freeform.renderForms ()]])
    def lookupName (self, *args, **kw):
        request = self.context.locate (inevow.IRequest)
        request.setComponent (inevow.IRedirectAfterPost,
                              "/taxon/" + kw['name'])