The following classes of elements are used in the software DTD:
 
sw-addressing-method-class
 
sw-data-dictionary-class
 
sw-function-class
 
sw-param-class
 
sw-param-contents-class
 
sw-param-record-layout-class
 
sw-code-syntax-class
The element name is suffixed by "-class" for all classed elements. The classes are not standardized and are not defined in the DTD. It is however recommended to use certain class designations, e.g. according to ASAP. Proposals are made to this end. Refer to <sw-param-class>, e.g. "value". The class designations are to be agreed between the project partners.