Perform the key field parsing
lexer.match('k");
lexer.SPorHT();
lexer.match('=");
lexer.SPorHT();
KeyField keyField = new KeyField();
NameValue nameValue = nameValue();
String name = nameValue.getName();
String value = (String) nameValue.getValue();
keyField.setType(name);
keyField.setKeyData(value);
return keyField;