tracker-extract: XMP: Fix strings that go like "n1/n2" that are xsd:double
tracker-extract: XMP: Fix strings that go like "n1/n2" that are xsd:double

hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker