include dom id of the form in __errorurl in case there are multiple forms in a page
class YamsEntity(EntityType):
if 'Blog' in defined_types and 'Article' in defined_types:
ambiguous_relation = SubjectRelation(('Blog', 'Article'))
if 'Blog' in defined_types:
inlined_relation = SubjectRelation('Blog', cardinality='?*')
class inlined_relation(RelationType):
inlined = True