* Specification [[manakai//DOM Extensions]] > [[DOM XML Document Type Definition]] module > The [CODE(DOMi)@en[[[ElementTypeDefinition]]]] interface ** Modifications to [CODE(DOMi)@en[[[Node]]]] members [3] The getter of the [CODE(DOMa)@en[[[attributes]]]] attribute of an [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object [['''MUST''']] return [CODE(IDL)@en[[[null]]]]. [4] The getter of the [CODE(DOMa)@en[[[baseURI]]]] attribute of an [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object [['''MUST''']] return the [CODE(DOMa)@en[[[baseURI]]]] of the [CDOE(DOMa)@en[[[ownerDocument]]]] of the [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object. Note that it might be [CODE(IDL)@en[[[null]]]]. [1] The getter of the [CODE(DOMa)@en[[[nodeName]]]] attribute of an [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object [['''MUST''']] return the name of the element type. [2] The getters of the [CODE(DOMa)@en[[[nodeValue]]]] and [CODE(DOMa)@en[[[textContent]]]] attributes of an [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object [['''MUST''']] return [CODE(IDL)@en[[[null]]]]. ;; Thus, the setter of these attributes do nothing. The setter of the [CODE(DOMa)@en[[[textContent]]]] attribute of an [CODE(DOMi)@en[[[ElementTypeDefinition]]]] object [['''MUST NOT''']] throw a [CODE(DOMc)@en[[[NO_MODIFICATION_ALLOWED_ERR]]]]. * memo