Check if field exists (if it comes from behavior)

Plone Support Add-on Development
1

How can I check if a field exists if it comes from a behavior?

For 'normal fields', I can do:

if field in getFields(schema)

Is there a 'similar way' ?

2 
from plone.dexterity.utils import iterSchemata
from zope.schema import getFieldsInOrder

for schema in iterSchemata(self.context):
  print('  %s' % schema)
  for field in getFieldsInOrder(schema):
    print('    %s\t%s' % field)
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