Dear Jiba,
First of all Thank You for this valuable library! I use it trying to implement a knowledge based personal assistant. ;o)
I have an issue calling "declare_datatype" once one world is closed. The following code snippet is a minimal example to reproduce this behavior:
>>>
import owlready2 as or2
class AnyURI(object):
def __init__(self, value):
self.value = value
@staticmethod
def parser(iri):
return AnyURI(iri)
@staticmethod
def unparser(any_uri):
return any_uri.value
w1 = or2.World()
w2 = or2.World()
w1.close()
or2.declare_datatype(AnyURI, '
http://www.w3.org/2001/XMLSchema#anyURI', AnyURI.parser, AnyURI.unparser)
<<<
This raises: "sqlite3.ProgrammingError: Cannot operate on a closed database." happening in the declare_datatype function. I guess it is because w1 is still a part of or2.WORLDS and world.graph.read_only is False.
I worked around that problem by setting read_only to True after closing the world. Maybe this could be integrated directly into the close()-method of the World class. An alternative could be to remove this world from or2.WORLDS on closing. I tried both approaches, but the second sporadically still caused exceptions in my case.
Best regards,
Robert
Locked
