## add(property) {#customxmlproperty} Adds a property to the collection. ```python def add(self, property: aspose.words.markup.CustomXmlProperty): ... ``` | Parameter | Type | Description | | --- |......## add(property) {#customxmlproperty} Adds a property to the...collection. ```python def add(self, property: aspose.words.markup.CustomXmlProperty):...