Create missing classes for Transcription, Corpus

Closes #135 (closed)

arkindex_worker/models.py

@@ -220,3 +220,21 @@ class Element(MagicDict):
         else:
             type_name = str(self.type)
         return "{} {} ({})".format(type_name, self.name, self.id)
+
+
+class Transcription(MagicDict):
+    """
+    Describes an Arkindex element's transcription.
+    """
+
+    def __str__(self):
+        return "Transcription ({})".format(self.id)
+
+
+class Corpus(MagicDict):
+    """
+    Describes an Arkindex corpus.
+    """
+
+    def __str__(self):
+        return "Corpus {} ({})".format(self.name, self.id)