Re: Assign missing datatypes

Posted by Jiba on Jun 19, 2020; 1:44pm
URL: http://owlready.306.s1.nabble.com/Assign-missing-datatypes-tp1845p1850.html

Hi,

You're right, there is no way to add custom datatype in Owlready... I've added the declare_datatype() global function for that, in the development version on BitBucket.

Here is an example:

class Hex(object):
    def __init__(self, value):
    self.value = value
   
def parser(s):
    return Hex(int(s, 16))
   
def unparser(x):
    h = hex(x.value)[2:]
    if len(h) % 2 != 0: return "0%s" % h
    return h
   
declare_datatype(Hex, "http://www.w3.org/2001/XMLSchema#hexBinary", parser, unparser)

onto = world.get_ontology("http://www.test.org/t.owl")
   
with onto:
    class p(Thing >> Hex): pass
    class C(Thing): pass
    c1 = C()
    c1.p.append(Hex(14))


Jiba