This interface represents a notation declared in the DTD.
A notation either declares, by name, the format of an unparsed entity (see section 4.7 of the XML 1.0 specification), or is used for formal declaration of processing instruction targets (see section 2.6). The nodeName attribute inherited from Node is set to the declared name of the notation.
The DOM Level 1 does not support editing Notation nodes; they are therefore readonly.
A Notation node does not have any parent.