private void parseNotationType() throws Exception {
        requireWhitespace();
        require('(');

        parseEnumeration(true);
    }
Parse a notation type for an attribute.

<pre>
  [58] NotationType ::= 'NOTATION' S '(' S? NameNtoks
     (S? '|' S? name)* S? ')'
</pre>

<p>
NOTE: the 'NOTATION' has already been read
src/nu/validator/gnu/xml/aelfred2/XmlParser.java