In order to document change history of subjects, the following approach is recommended:
 
Insert one <ablock> for each particular revision of a file or a group.
 
Use different file names for each version. In particular, it is recommended to code the revision label into the file name such as myfile-01-07.txt.
 
Place the version information into <metadata> as pointed out in this document.
 
Add a <field-set class="revision-history"> to each <ablock> and populate it with a <field name="comment"> to submit the version comment.
<CATALOG NAME="ARMD" CATALOG-CLASS="History-overview" VERSION="1.0" MODIFICATION-DATE="Fri Mar 03 19:39:38 2000"> <ABLOCK NAME="ARMD" LABEL="10.30"> <FIELDS> <FIELD-SET CLASS="Revision-history"> <FIELD NAME="comment"> This is the coment for Revision 10.30 </FIELD> </FIELD-SET> </FIELDS> <FILE>fkt-armd-10.30-0.pdf</FILE> </ABLOCK> <ABLOCK NAME="ARMD" LABEL="10.40"> <FIELDS> <FIELD-SET CLASS="Revision-history"> <FIELD NAME="comment"> this is the coment for Revision 10.40 </FIELD> </FIELD-SET> </FIELDS> <FILE>fkt-armd-10.40-0.pdf</FILE> </ABLOCK> </CATALOG>