code: def get_schema(brain_or_object):
      
      obj = get_object(brain_or_object)
      if is_portal(obj):
          fail("get_schema can't return schema of portal root")
      if is_dexterity_content(obj):
          pt = get_tool("portal_types")
          fti = pt.getTypeInfo(obj.portal_type)
          return fti.lookupSchema()
      if is_at_content(obj):
          return obj.Schema()
      fail("{} has no Schema.".format(brain_or_object))
docs: Get the schema of the content
  
      :param brain_or_object: A single catalog brain or content object
      :type brain_or_object: ATContentType/DexterityContentType/CatalogBrain
      :returns: Schema object