Update systemid.xml
You must tell IXIASOFT CCMS how to refactor the doctype declaration for any subjectScheme maps that you import. In previous releases of IXIASOFT CCMS, there were separate DTDs for subjectScheme maps and therefore a unique doctype declaration for them. IXIASOFT's implementation of DITA 1.3 integrates subjectScheme into the shell map DTD and therefore subjectScheme maps use the same doctype declaration as maps and bookmaps.