diff --git a/stw_potsdam/xml_types/canteen_xml.py b/stw_potsdam/xml_types/canteen_xml.py
index c25ffd2..37926c5 100644
--- a/stw_potsdam/xml_types/canteen_xml.py
+++ b/stw_potsdam/xml_types/canteen_xml.py
@@ -75,10 +75,10 @@ class CanteenXML:
         self.days = {} if days is None else days
 
     def __create_node(self, doc: minidom.Document, tag: str, value: str):
-        e = doc.createElement(tag)
-        tn = doc.createTextNode(value)
-        e.appendChild(tn)
-        return e
+        elem = doc.createElement(tag)
+        txt_node = doc.createTextNode(value)
+        elem.appendChild(txt_node)
+        return elem
 
     def __append_meta(self, doc: minidom.Document, canteen: minidom.Element):
         name = self.__create_node(doc, "name", self.canteen_meta.name)
diff --git a/stw_potsdam/xml_types/feed_xml.py b/stw_potsdam/xml_types/feed_xml.py
index 9ca03dc..edcb315 100644
--- a/stw_potsdam/xml_types/feed_xml.py
+++ b/stw_potsdam/xml_types/feed_xml.py
@@ -71,12 +71,12 @@ class FeedXML:
         feed.appendChild(schedule)
 
         url = doc.createElement("url")
-        tn = doc.createTextNode(self.url)
-        url.appendChild(tn)
+        txt_node = doc.createTextNode(self.url)
+        url.appendChild(txt_node)
         feed.appendChild(url)
 
         source = doc.createElement("source")
-        tn = doc.createTextNode(self.source)
-        source.appendChild(tn)
+        txt_node = doc.createTextNode(self.source)
+        source.appendChild(txt_node)
         feed.appendChild(source)
         return feed
diff --git a/stw_potsdam/xml_types/meal_xml.py b/stw_potsdam/xml_types/meal_xml.py
index ef2b653..d9629a2 100644
--- a/stw_potsdam/xml_types/meal_xml.py
+++ b/stw_potsdam/xml_types/meal_xml.py
@@ -26,13 +26,13 @@ class MealXML:
         """
         meal = doc.createElement("meal")
         name = doc.createElement("name")
-        tn = doc.createTextNode(self.name)
-        name.appendChild(tn)
+        txt_node = doc.createTextNode(self.name)
+        name.appendChild(txt_node)
         meal.appendChild(name)
         if self.note is not None:
             note = doc.createElement("note")
-            tn = doc.createTextNode(self.note)
-            note.appendChild(tn)
+            txt_node = doc.createTextNode(self.note)
+            note.appendChild(txt_node)
             meal.appendChild(note)
 
         for key, val in self.price.items():
@@ -40,7 +40,7 @@ class MealXML:
                 continue
             price = doc.createElement("price")
             price.setAttribute("role", key)
-            tn = doc.createTextNode(f"{val:.2f}")
-            price.appendChild(tn)
+            txt_node = doc.createTextNode(f"{val:.2f}")
+            price.appendChild(txt_node)
             meal.appendChild(price)
         return meal
diff --git a/stw_potsdam/xml_types/openmensa_xml.py b/stw_potsdam/xml_types/openmensa_xml.py
index dc43651..9022e5e 100644
--- a/stw_potsdam/xml_types/openmensa_xml.py
+++ b/stw_potsdam/xml_types/openmensa_xml.py
@@ -18,10 +18,10 @@ class OpenMensaXML:
         self.canteen = canteen
 
     def __create_version_node(self, doc: minidom.Document):
-        e = doc.createElement("version")
-        tn = doc.createTextNode(self.version)
-        e.appendChild(tn)
-        return e
+        elem = doc.createElement("version")
+        txt_node = doc.createTextNode(self.version)
+        elem.appendChild(txt_node)
+        return elem
 
     def xml_element(self, doc: minidom.Document):
         """Create openmensa XML tag.
@@ -32,20 +32,20 @@ class OpenMensaXML:
         Returns:
             _type_: _description_
         """
-        om = doc.createElement("openmensa")
-        om.setAttribute("version", "2.1")
-        om.setAttribute("xmlns", "http://openmensa.org/open-mensa-v2")
-        om.setAttribute(
+        open_mensa = doc.createElement("openmensa")
+        open_mensa.setAttribute("version", "2.1")
+        open_mensa.setAttribute("xmlns", "http://openmensa.org/open-mensa-v2")
+        open_mensa.setAttribute(
             "xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance"
         )
-        om.setAttribute(
+        open_mensa.setAttribute(
             "xsi:schemaLocation",
             "http://openmensa.org/open-mensa-v2 "
             + "http://openmensa.org/open-mensa-v2.xsd",
         )
 
         version = self.__create_version_node(doc)
-        om.appendChild(version)
+        open_mensa.appendChild(version)
         canteen = self.canteen.xml_element(doc)
-        om.appendChild(canteen)
-        return om
+        open_mensa.appendChild(canteen)
+        return open_mensa
diff --git a/stw_potsdam/xml_types/times_xml.py b/stw_potsdam/xml_types/times_xml.py
index 363e148..210034c 100644
--- a/stw_potsdam/xml_types/times_xml.py
+++ b/stw_potsdam/xml_types/times_xml.py
@@ -35,12 +35,12 @@ class TimesXML:
                 raise KeyError()
 
     def __create_node(self, doc: minidom.Document, tag: str, value: str):
-        e = doc.createElement(tag)
+        elem = doc.createElement(tag)
         if value == "geschlossen":
-            e.setAttribute("closed", "true")
+            elem.setAttribute("closed", "true")
         else:
-            e.setAttribute("open", value)
-        return e
+            elem.setAttribute("open", value)
+        return elem
 
     def xml_element(self, doc: minidom.Document):
         """Return the XML representation.