gistfile1.py

class EcoregionLayerIndex(db.Model): #parent = an EcoregionSet
    terms = db.CategoryProperty()
    
class EcoregionLayer(db.Model):
    name = db.StringProperty()
    id = db.StringProperty()
    ecoCodes = db.ListProperty(db.Key)
    
class MOLLayers(db.Model):
    layer = db.Key()
    terms = db.CategoryProperty()

#or

class MOLLayers(db.Model): #key_name = search term
    layers = db.ListProperty(db.Key)