|Notations are how the Document Type Description (DTD) records hints
about the format of an XML "unparsed entity" -- in other words,
non-XML data bound to this document type, which some applications
may wish to consult when manipulating the document. A Notation
represents a name-value pair, with its nodeName being set to the
declared name of the notation.
Notations are also used to formally declare the "targets" of
Note that the Notation's data is non-DOM information; the DOM only
records what and where it is.
See the XML 1.0 spec, sections 4.7 and 2.6, for more info.
Level 1 of the DOM does not support editing Notation contents.