Fix problems saving Exif data to Xmp sidecar

src/photini/__init__.py

@@ -1,4 +1,4 @@
 """Full documentation is at https://photini.readthedocs.io/"""
 
-__version__ = '2022.12.0.1'
-build = '2338 (c736fe3)'
+__version__ = '2022.12.0.2'
+build = '2339 (f33ce98)'

src/photini/types.py

@@ -75,10 +75,10 @@ def to_exif(self):
         return str(self)
 
     def to_iptc(self):
-        return self.to_exif()
+        return str(self)
 
     def to_xmp(self):
-        return self.to_exif()
+        return str(self)
 
     def merge(self, info, tag, other):
         result, merged, ignored = self.merge_item(self, other)
@@ -618,6 +618,10 @@ def from_exiv2(cls, file_value, tag):
             file_value = [(short_focal, focal_units), (long_focal, focal_units)]
         return cls(file_value)
 
+    def to_xmp(self):
+        return ' '.join(['{}/{}'.format(x.numerator, x.denominator)
+                         for x in self.to_exif()])
+
     def __str__(self):
         return ','.join(['{:g}'.format(float(self[x])) for x in self._keys])
 
@@ -1166,9 +1170,6 @@ def from_exiv2(cls, file_value, tag):
     def to_exif(self):
         return str(int(self + 1.5) - 1)
 
-    def to_xmp(self):
-        return str(self)
-
 
 class MD_Rational(MD_Value, Fraction):
     def __new__(cls, value):
@@ -1177,6 +1178,9 @@ def __new__(cls, value):
     def to_exif(self):
         return self
 
+    def to_xmp(self):
+        return '{}/{}'.format(self.numerator, self.denominator)
+
     def __str__(self):
         return str(float(self))
 
@@ -1235,5 +1239,9 @@ def to_exif(self):
             file_value.append(apex)
         return file_value
 
+    def to_xmp(self):
+        return ['{}/{}'.format(x.numerator, x.denominator)
+                for x in self.to_exif()]
+
     def contains(self, this, other):
         return float(min(other, this)) > (float(max(other, this)) * 0.95)