All files for deployment ready and tested - further development in this repo.

referenzen/models.py

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+from django.db import models
+from mptt.models import MPTTModel, TreeForeignKey
+from abschnitte.models import Textabschnitt
+
+# Create your models here.
+class Referenz(MPTTModel):
+    id = models.AutoField(primary_key=True)
+    name_nummer = models.CharField(max_length=100)
+    name_text=models.CharField(max_length=255, blank=True)
+    oberreferenz = TreeForeignKey(
+        'self', null=True, blank=True, on_delete=models.SET_NULL, related_name='unterreferenzen'
+    )
+    url = models.URLField(blank=True)
+
+    def Path(self):
+        Temp = " → ".join([str(x) for x in self.get_ancestors(include_self=True)])+(" (%s)"%self.name_text if self.name_text else "")
+        return Temp
+
+    class MPTTMeta:
+        parent_attr = 'oberreferenz'  # optional, but safe
+        order_insertion_by = ['name_nummer']
+
+    def __str__(self):
+        return self.name_nummer
+
+    class Meta:
+        verbose_name_plural="Referenzen"
+
+class Referenzerklaerung (Textabschnitt):
+    erklaerung = models.ForeignKey(Referenz,on_delete=models.CASCADE)
+
+    class Meta:
+        verbose_name="Erklärung"