Enhanced complex concepts handling

core/concept.py

@@ -129,6 +129,15 @@ class Concept:
     def __hash__(self):
         return hash(self.metadata.name)
 
+    def __getattr__(self, item):
+        # I have this complicated implementation because of the usage of Pickle
+
+        if 'props' in vars(self) and item in self.props:
+            return self.props[item].value
+
+        name = self.name if 'metadata' in vars(self) else 'Concept'
+        raise AttributeError(f"'{name}' concept has no attribute '{item}'")
+
     @property
     def name(self):
         return self.metadata.name
@@ -166,7 +175,7 @@ class Concept:
             if token.type == TokenKind.WHITESPACE:
                 continue
             if not first:
-                key += " "
+                key += " " # spaces are normalized
             if variables is not None and token.value in variables:
                 key += VARIABLE_PREFIX + str(variables.index(token.value))
             else: