The fourth data class is the notation, which is available only as a return value from the notation method of an SGMLS_Entity or the value method of an SGMLS_Attribute with type 'NOTATION'. You can use the notation to decide how to treat non-SGML data (such as graphics). An object belonging to the SGMLS_Notation class will have access to the methods listed in table 6.
What you do with this information is entirely up to you.
David Megginson <dmeggins@aix1.uottawa.ca>