## add(property) {#customxmlproperty} Adds a property to the collection. ```python def add(self, property: aspose.words.markup.CustomXmlProperty): ... ``` | Parameter | Type | Description | | --- |...... smart_tags = list(filter(lambda a: a is not None...of_type(lambda x: x.as_smart_tag(), b), list(doc.get_child_nodes(aw.NodeType...