IBMIDDOC is the SGML language used for IBM's production publishing.  
This distribution contains the IBMIDDOC DTD and some associated 
processing and sample files.

ibmiddoc.txt description of all files
ibmiddoc.zip IBMIDDOC DTD and associated processing files
iddocpdf.zip User Documentation for the IBMIDDOC DTD
zenbook.zip  Sample IBMIDDOC document