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 # ElementSelectionRule

 Last update: 16.07.2026 

<a id="compolyx.ElementSelectionRule"></a>

### *class* compolyx.ElementSelectionRule(graph, obj, parent=None)

Base class for rules. This acts as an interface to the cpp object of the rules. The base class implements \_py\_update which is called after the cpp update. It sets the changed flag. Since NameGraph derives from Observable, observers can listen on ‘changed’.

In order to support csv\_serialization, the classes have to implement a ‘\_dict’ method and a list named ‘\_csv\_parameters’. The \_dict method specifies which properties are written and \_csv\_parameters specifies which parameters are read and how they are parsed. The keys in \_dict and the elements in \_parameters\_csv have to be consistent. If the conversion from the string to an object is more than simple type conversion, it can be implemented in \_update\_rule\_from\_csv.

### Attributes

NameDescription[`ElementSelectionRule.active`](compolyx.ElementSelectionRule.active.md#compolyx.ElementSelectionRule.active)Active status of the object.[`ElementSelectionRule.changed`](compolyx.ElementSelectionRule.changed.md#compolyx.ElementSelectionRule.changed)Triggers an observable to dispatch a change notification.[`ElementSelectionRule.enabled`](compolyx.ElementSelectionRule.enabled.md#compolyx.ElementSelectionRule.enabled)Indicates whether the object is enabled.[`ElementSelectionRule.extent`](compolyx.ElementSelectionRule.extent.md#compolyx.ElementSelectionRule.extent)Extent of the rule.[`ElementSelectionRule.id`](compolyx.ElementSelectionRule.id.md#compolyx.ElementSelectionRule.id)ID of the object.[`ElementSelectionRule.include_rule_type`](compolyx.ElementSelectionRule.include_rule_type.md#compolyx.ElementSelectionRule.include_rule_type)include type.[`ElementSelectionRule.is_dict_item`](compolyx.ElementSelectionRule.is_dict_item.md#compolyx.ElementSelectionRule.is_dict_item)Indicates whether the object is an item in a dictionary.[`ElementSelectionRule.is_list_item`](compolyx.ElementSelectionRule.is_list_item.md#compolyx.ElementSelectionRule.is_list_item)Indicates whether the object is an item of a list.[`ElementSelectionRule.link_path`](compolyx.ElementSelectionRule.link_path.md#compolyx.ElementSelectionRule.link_path)Root path of the current node in the tree for links to this object.[`ElementSelectionRule.name`](compolyx.ElementSelectionRule.name.md#compolyx.ElementSelectionRule.name)Name of the object.[`ElementSelectionRule.parent`](compolyx.ElementSelectionRule.parent.md#compolyx.ElementSelectionRule.parent)Parent object in the tree.[`ElementSelectionRule.relative_rule_type`](compolyx.ElementSelectionRule.relative_rule_type.md#compolyx.ElementSelectionRule.relative_rule_type)relative type.[`ElementSelectionRule.root_path`](compolyx.ElementSelectionRule.root_path.md#compolyx.ElementSelectionRule.root_path)Root path of the current node in the tree.[`ElementSelectionRule.status`](compolyx.ElementSelectionRule.status.md#compolyx.ElementSelectionRule.status)Status of the object.[`ElementSelectionRule.status_changed`](compolyx.ElementSelectionRule.status_changed.md#compolyx.ElementSelectionRule.status_changed)Boolean flag which is set to true in C++ when up-to-date status of object changes.[`ElementSelectionRule.uid`](compolyx.ElementSelectionRule.uid.md#compolyx.ElementSelectionRule.uid)UID of the object.[`ElementSelectionRule.vertex`](compolyx.ElementSelectionRule.vertex.md#compolyx.ElementSelectionRule.vertex)Raises an error if the object has been removed from the graph.### Methods

NameDescription[`ElementSelectionRule.find_parent`](compolyx.ElementSelectionRule.find_parent.md#compolyx.ElementSelectionRule.find_parent)(type)Steps up the tree and returns the first parent with given type.[`ElementSelectionRule.obj_exists`](compolyx.ElementSelectionRule.obj_exists.md#compolyx.ElementSelectionRule.obj_exists)()Checks if \_\_obj still references the c++ object (has not been reset to None by self.\_delete) and exists in the graph.[`ElementSelectionRule.serialize_name_and_id`](compolyx.ElementSelectionRule.serialize_name_and_id.md#compolyx.ElementSelectionRule.serialize_name_and_id)()Serializes the name and ID.[`ElementSelectionRule.serialize_rule_types`](compolyx.ElementSelectionRule.serialize_rule_types.md#compolyx.ElementSelectionRule.serialize_rule_types)()[`ElementSelectionRule.update`](compolyx.ElementSelectionRule.update.md#compolyx.ElementSelectionRule.update)()[`ElementSelectionRule.visit`](compolyx.ElementSelectionRule.visit.md#compolyx.ElementSelectionRule.visit)(visitor)Walk through the tree and let the visitor perform action on every descendant node.