protected function parseValueCopy($sourceObjectPath, $targetObjectPath)
    {
        $sourceObjectPathArray = $this->getParsedObjectPath($sourceObjectPath);
        $targetObjectPathArray = $this->getParsedObjectPath($targetObjectPath);

        $sourceIsPrototypeDefinition = (count($sourceObjectPathArray) >= 2 && $sourceObjectPathArray[count($sourceObjectPathArray) - 2] === '__prototypes');
        $targetIsPrototypeDefinition = (count($targetObjectPathArray) >= 2 && $targetObjectPathArray[count($targetObjectPathArray) - 2] === '__prototypes');

        if ($sourceIsPrototypeDefinition || $targetIsPrototypeDefinition) {
            // either source or target are a prototype definition
            if ($sourceIsPrototypeDefinition && $targetIsPrototypeDefinition && count($sourceObjectPathArray) === 2 && count($targetObjectPathArray) === 2) {
                // both are a prototype definition and the path has length 2: this means
                // it must be of the form "prototype(Foo) < prototype(Bar)"
                $targetObjectPathArray[] = '__prototypeObjectName';
                $this->setValueInObjectTree($targetObjectPathArray, end($sourceObjectPathArray));
            } elseif ($sourceIsPrototypeDefinition && $targetIsPrototypeDefinition) {
                // Both are prototype definitions, but at least one is nested (f.e. foo.prototype(Bar))
                // Currently, it is not supported to override the prototypical inheritance in
                // parts of the TS rendering tree.
                // Although this might work conceptually, it makes reasoning about the prototypical
                // inheritance tree a lot more complex; that's why we forbid it right away.
                throw new Fusion\Exception('Tried to parse "' . $targetObjectPath . '" < "' . $sourceObjectPath . '", however one of the sides is nested (e.g. foo.prototype(Bar)). Setting up prototype inheritance is only supported at the top level: prototype(Foo) < prototype(Bar)', 1358418019);
            } else {
                // Either "source" or "target" are no prototypes. We do not support copying a
                // non-prototype value to a prototype value or vice-versa.
                throw new Fusion\Exception('Tried to parse "' . $targetObjectPath . '" < "' . $sourceObjectPath . '", however one of the sides is no prototype definition of the form prototype(Foo). It is only allowed to build inheritance chains with prototype objects.', 1358418015);
            }
        } else {
            $originalValue = $this->getValueFromObjectTree($sourceObjectPathArray);
            $value = is_object($originalValue) ? clone $originalValue : $originalValue;

            $this->setValueInObjectTree($targetObjectPathArray, $value);
        }
    }