code: def load(schema, uri=None, spec=None, provider=None):
      
      factory = Factory(provider, spec)
      return factory(schema, uri or '#')
docs: Scaffold a validator against a schema.
  
      :param schema: the schema to compile into a Validator
      :type schema: Mapping
      :param uri: the uri of the schema.
                  it may be ignored in case of not cross
                  referencing.
      :type uri: Pointer, str
      :param spec: fallback to this spec if the schema does not provides ts own
      :type spec: str
      :param provider: the other schemas, in case of cross
                       referencing
      :type provider: Mapping, Provider...